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JoinMap 5 Release Notes
=========================

=== 21 February 2018 ===
Update and maintenance release of JoinMap 5
  (Build: 21feb2018.11oct2017)

Added functionality:
- Map nodes resulting directly from mapping contain various tabsheets
  with diagnostics about the loci, such as the N.N. Fit and Stress. In
  these tabsheets, rows can be marked and subsequently the Map menu
  function 'Exclude Marked Loci in Group Node' can be applied. In the
  map node's grandparental group node this will check the Exclude
  checkboxes of the loci that correspond to the marked rows.

- Marked regions in the Dataset tabsheet and in editable plain text
  tabsheets (e.g. Notes) can be deleted with key combination Ctrl+Del
  and with an option of the Edit menu.

- A new menu function 'Flip Marked Genotypes' was added for the
  dataset node. Sometimes genotypes may have been coded erroneously,
  e.g. the A was used instead of the B and vice versa; this may result
  in recombination frequency estimates larger than 0.5, showing up in
  a group node's Suspect Linkages tabsheet. This 'Flip' function will
  allow easy correction of such genotype data in the dataset node.
  The function will replace genotype codes in the marked region in
  their opposite codes. The type of replacement depends on the
  population type.
    In a BC1, the A's will be replaced by H's and v.v. if there are
  A's in the marked range, while if there are B's in the marked range
  then B's will be replaced by H's and v.v..
    For population types DH, HAP, HAP1, DH1 and DH2 the A's will be
  replaced by B's and v.v..
    For population types BCpxFy, RIx, IMxFy and F2 the same happens,
  and in addition C's will be replaced by D's and v.v..
    For population type CP the following genotype mutual replacements
  take place:  ad <=> bc,  ef <=> eg,  ll <=> nn,  lm <=> np,
  while in addition the segregation types <lmxll> and <nnxnp> will be
  replaced by each other as well as their corresponding phase and
  classification types.
    In all cases the replacement is case-insensitive and also the
  genotype code must be a correct one, incorrect codes are left
  unchanged. Therefore, it is advised to apply (and pass succesfully)
  the 'Check for Coding Errors' function in advance to the flip.

- Another function was added to the Dataset menu: 'Create Dataset from
  Data Tabsheet'. This function creates a new dataset node and fills
  it with the genotype data of a marked population, group or map node
  that has a Data tabsheet with genotype data. The data of loci and
  individuals that are checked as excluded on the Loci and Individuals
  tabsheets, if present, will not be transfered to the new dataset
  node.

Adjusted:
- The color of marked regions in the tables is changed to red. (Marked
  regions in plain text remains the MS-Windows default, usually blue.)

- The system of marking nodes in the navigation panel is improved.


=== 8 January 2018 ===
Update and maintenance release of JoinMap 5
  (Build: 8jan2018.11oct2017)

Corrections in the ML mapping algorithm:
- The expected recombination counts, the map distances and possibly
  the map order were estimated erroneously for population type BCbxFy.
- The N.N. Stress was computed erroneously for a few population types:
  BC1 (only if coded with H's and B's), BCbxFy, DH and HAP.
  These errors were present since the first pre-release.


=== 20 December 2017 ===
Update and maintenance release of JoinMap 5
  (Build: 20dec2017.11oct2017)

Adjusted functionality:
- The map building approach of the ML mapping algorithm was adjusted
  to become more reliable for high density maps. Spatial sampling is
  still being used for gradually building the map. After the sampling
  threshold becomes 0, then now the building proceeds with adding
  batches of loci instead of adding all remaining loci in one go.
  The loci in each batch are selected at random. The batches are of a
  fixed size, which can be adjusted in the Calculation Options. Three
  of the map optimization (simulated annealing) parameters are now
  specific to each spatial sampling level (now called S1 to S5) and to
  the building with batches after the sampling threshold of 0 is
  reached (called T0). This is meant to be able to speed up the first
  map building levels. The three parameters are: (1) the number of
  optimization rounds per sample, (2) the chain length with constant
  acceptance probability and (3) the stop criterion (stop after #
  chains without improvement).
- The history of the status bar is increased to 50 messages.
- Two parameters used in the true EM approach with the multipoint
  recombination frequency estimation are adjustable in the Calculation
  Options: the maximum number of iterations and the recombination
  frequency tolerance. These parameters determine when the EM
  iterations should stop.

Correction:
- When applying the 'Invert Map' function of a map node, the Plausible
  Positions tabsheet did invert the map, but failed to show the
  position counts at their inverted positions and a recalculation
  would be required. This is now working as expected.


=== 6 November 2017 ===
Update and maintenance release of JoinMap 5
  (Build: 6nov2017.11oct2017)

Added functionality:
- The 'Colorize' function for graphical genotypes takes the linkage
  phases (if available) into account for population types CP, DH and
  HAP.

The following adjustment was made:
- The new (more efficient) locus replacement strategy in the map order
  optimization method (i.e. simulated annealing) turned out to work
  not very well if the number of loci that is added after the last
  spatial sampling threshold is large. For the time being the strategy
  is returned to that of JoinMap v4.1.
  Remark: This does not apply to population type CP. Here the new
  strategy is not yet applied.


=== 27 October 2017 ===
Update and maintenance release of JoinMap 5
  (Build: 27oct2017.11oct2017)

Added functionality:
- Export Map tabsheets from multiple marked map nodes as one joint
  map-file (e.g. for use with MapQTL).
- Export Data tabsheets from multiple marked nodes (population, group
  or map nodes) as one joint loc-file (e.g. for use with MapQTL).

The following corrections were made:
- Individual Genot. Freq. tabsheet would compute all frequencies to
  be 0 for certain individuals if some loci were excluded.
- Assigning ungrouped loci to their SCL-groups at a grouping node
  could lead to an 'access violation' error if a threshold value other
  than the default is used.
- In extreme situations the multipoint recombination frequecy
  estimation procedure could result in a floating point error
  (division by zero).
- Using the 'Move Marked Loci' of grouping nodes did not adjust the
  corresponding group nodes correctly.


=== 7 October 2017 ===
Update and maintenance release of JoinMap 5
  (Build: 7oct2017.2jun2017)

Added functionality:
- Export Map tabsheets as map-files.

The following corrections were made:
- Selecting another node after a map node was selected could lead to
  an 'access violation' error causing the program to stop working.
- Repeatedly doing computations that are done in parallel, like
  calculating groupings, could make the program appear to freeze.


=== 25 September 2017 ===
Update and maintenance release of JoinMap 5
  (Build: 25sep2017.2jun2017)

Added functionality:
- Map charts.
- Copying marked regions in the Further Information window.

The following corrections were made:
- In the computations of pairwise data, numerical problems could lead
  to tiny negative LOD values instead of exactly 0.
- The new, true EM algorithm for multipoint recombination frequency
  estimation could result in some runtime errors ('root not
  bracketed ...', 'division by zero', 'rec.freq. larger than 0.5'),
  preventing the computation of the map or the plausible positions.

NB:
  Because some parameter settings had to be changed, the first time
  the new release is run JoinMap will show two error messages about
  reading the program and page setup; these can be ignored.


=== 11 August 2017 ===
Update and maintenance release of JoinMap 5
  (Build: 11aug2017.2jun2017)

Added functionality:
- Copying and cutting marked regions in plain text tabsheets
  (previously the entire text was taken).

The following corrections were made:
- Due to repeated rounding errors, the interpolation to compute the
  integrated map with population type CP could result in map positions
  of <lmxll> and <nnxnp> markers just outside their interval (less
  than 1e-14 cM). This would result in the next type of error message
  when trying to view the Data tabsheet of or do computations with a
  map node:
    'ReadLoci_SQLite() map position of locus X before that of Y'.
  This is now prevented.
- Fixed and Start order tabsheets were made tolerant for the type of
  newline characters (CR, LF, CR+LF, LF+CR) used with pasted orders.
  Previously this could lead to unrecognized locus names.
- Pasting into plain text tabsheets was made tolerant for the type of
  newline character and for lines longer than the maximum of 1024
  characters. This applies to the Notes, Start and Fixed order
  tabsheets.
- The Dataset node function 'Check for Coding Errors' did not accept
  correct phase type codes for segregation type <nnxnp>; repaired.


=== 14 July 2017 ===
Update and maintenance release of JoinMap 5
  (Build: 14jul2017.2jun2017)

Added functionality:
- 'Move Marked Loci' menu function for grouping nodes.

The following corrections were made:
- The Individual Genotypes Frequencies were determined without taking
  the exclusion of loci into account. Now they are.
- In fields of floating point parameters (e.g. in the Calculation
  Options) the decimal point could not be entered. Now it is possible.
- The reporting about any incompleteness in linkage phase
  determination in the population node computations of groupings was
  poor. Now identicals are not reported anymore and the status whether
  loci are excluded is given.

The Help menu document with the new features of v5 is updated.


=== 3 June 2017 ===
Update and maintenance release of JoinMap 5
  (Build: 3jun2017.26apr2017)

Added functionality:
- marking regions in tables for functions on the marked loci or
  individuals;
- 'Exclude Marked Items' menu function for Individual Genot. Freq. and
  Locus Genot. Freq. tabsheets of population nodes;
- 'Set X2-Test Classification for Marked Loci' menu function for Locus
  Genot. Freq. tabsheet of population and map nodes;
- checking or un-checking a range of checkboxes in marked rows;
- copying and exporting marked rows of tables;
- toggling a checkbox with the Enter key.

The Help menu document with the new features of v5 is updated.

Some bugs were removed, one of which is the 'Invalid floating point
operation' obtained when computing a maximum likelihood map for
population type CP.


=== 16 May 2017 ===
Maintenance release of JoinMap 5
  (Build: 16may2017.26apr2017)

The computations of locus pairs did not deal correctly with
situations, where a locus has all observations missing. This
would lead to the error message
  'Par_Task_Interface->Status not completed'.
This is corrected.


=== 26 April 2017 ===
Early release of JoinMap 5
  (Build: 26apr2017.26apr2017)

= First public release. The final edition of JoinMap v5 is
  several months in the future. Because of the demand, a
  first stable early edition is released. Following this
  first release, subsequent updates with the remaining to be
  added functions will be released in the coming months.



JoinMap 4 & 4.1 Release notes
=============================


=== 31 July 2013 ===
Maintenance releases of JoinMap 4 and 4.1
  (Build: 31jul13.4feb11)

= A function is added to the Grouping node menu:
  'Assign Identical Loci to Their Groups'. The procedure to
  create a grouping node (see 6 and 19 March 2013) assigns
  sets of identical loci to group number 0, with the
  exception of one representing locus for each set. The new
  function will assign the identicals with group number 0 to
  the groups of their representing loci.


=== 19 March 2013 ===
Maintenance release of JoinMap 4
  (Build: 19mar13.4feb11)

= The same changes are applied to JoinMap 4 as in the recent
  maintenance release of JoinMap 4.1 of 6 March 2013.
  See below.


=== 6 March 2013 ===
Maintenance release of JoinMap 4.1
  (Build: 6mar13.4feb11)

= The grouping procedure of sets of loci into linkage
  groups used to be limited to sets of roughly 4000 loci due
  to available RAM memory. As the program is 32-bit it is
  limited by the maximum addressable amount of RAM. A new
  algorithm is implemented that is designed to store
  intermediate results on hard disk rather than in RAM. The
  program can now accommodate sets of up to ~50,000 loci,
  while keeping computation time within acceptable limits.
  On a typical present-day PC, the grouping procedure of
  50,000 loci takes about one hour. The speed of the hard
  disk is an important limiting factor. As the computations
  scale quadratically with the number of loci, groupings of
  smaller sets are still quite fast: 10,000 loci in about
  three minutes, 5000 loci in just about twenty seconds and
  1000 loci in a second.

  Beware that such oversized datasets require extreme file
  sizes: the 50,000 loci require a file of ~30 GB for the
  pairwise data. When creating the grouping node and group
  nodes, this file with pairwise data will be duplicated.
  Thus, ensure that the hard disk in use has sufficient free
  space when dealing with such datasets.

  In large datasets there will often be some redundancy (in
  fact, in most cases there should be). As an new feature
  the grouping procedure determines which loci are
  identical. Being identical is based on the entire set of
  genotype observations of all included (not excluded)
  individuals, including the missing observations. Sets of
  identical loci will be represented by one of them (the
  first not excluded locus). Identical loci will be
  specified at the bottom part of the 'Groupings (text)'
  tabsheet, while a numerical summary is given with the blue
  'Further information' tool bar button. One advantage is
  that the pairwise data will only be calculated for the
  loci that represent their identicals, thus reducing the
  computations.

  When determining a grouping node and group nodes, only the
  representing loci of sets of identical loci will be
  grouped, while in the grouping node tabsheet the identical
  loci will automatically obtain group number 0 (i.e. will
  not be part of a group), with 'identical' as Node name.

  The determination of the SCL-Values takes the identicals
  into account and will list 'identical' as SCL-Value to
  link them to their representing locus. The
  representing loci will obtain a regular SCL-Value.

  The procedure 'Assign Ungrouped Loci to SCL-Groups' will
  leave the identicals assigned to group 0.

  The procedure for determining a grouping based on a map or
  another grouping node will take the identicals into
  account and assign them to group 0.

  The grouping procedure may also be done based on the
  recombination frequency or the linkage LOD. For
  population types CP, DH and HAP, this means that the
  linkage phases must be determined to obtain these values.
  In the original procedure the pairs were sorted to their
  independence LOD value prior to the linkage phase
  determination. To be able to deal with very large datasets
  this sorting is not done anymore. The independence LOD
  threshold for pairs subject to phase determination, which
  used to be internally set at a LOD value 1.0, is now a
  Calculation Options parameter at the Population tabsheet:
  'Determine linkage phases ...'. When in doubt about the
  linkage phase determination you can increase this
  parameter value.

= The navigation panel could disappear after resizing it to
  the smallest size (by dragging the splitter between the
  navigation and the contents-and-results panel).
  Disappearing is now prevented.


=== 11 June 2012 ===
Maintenance release of JoinMap 4
  (Build: 11jun12.4feb11)

= In text tabsheets, like the 'Map (text)' tabsheet,
  sometimes a non-printable character got inserted at a
  random position (visible as a square character). It
  prevented copying the area around it. It is corrected.


=== 14 March 2012 ===
Maintenance releases of JoinMap 4 and 4.1
  (Build: 14mar12.4feb11)

= For population types DH, HAP and CP, the Linkage LODs for
  the Groupings (text and tree) tabsheet as well as the
  corresponding SCL-values of derived Grouping nodes were
  calculated erroneously. This is corrected.

= The calculation option 'Determine linkage phases (CP, DH,
  HAP) with a LOD larger than' was reset to the value 1.0
  each time the groupings of a population node were
  (re)calculated. This is corrected.


=== 4 August 2011 ===
Maintenance release of JoinMap 4.1
  (Build: 4aug11.4feb11)

= The Population menu functions 'Exclude Identicals' and
  'Exclude Similar Loci' could lead to runtime errors with
  larger datasets. The functions have been recoded and are
  now also much faster.

= Renaming the project file without renaming the project
  directory would lead to a rewritten, empty project file.
  This is corrected.


=== 3 August 2011 ===
Maintenance release of JoinMap 4
  (Build: 3aug11.4feb11)

= The Population menu functions 'Exclude Identicals' and
  'Exclude Similar Loci' could lead to runtime errors with
  larger datasets. The functions have been recoded and are
  now also much faster.

= The following minor errors were corrected:

  The heading in the Genotype Probabilities tabsheet had
  'R.Genotype' instead of 'Genotype' for the central
  genotype.

  Long group and map node names were made shorter than the
  allowed 20 characters when closing the project.

  Map charts would inexplicably draw some 'homologs' lines
  between loci that did not have identical names.

  The simulated annealing sometimes appeared to continue
  too long.

  For map nodes the 'Info on Tabsheet Contents' button and
  function in the File menu should be active for several
  tabsheets while they were not.

  Any fixed order used in the determination of plausible
  orders was not reported in the
  'Info on Tabsheet Contents'.

  The name of the HTTP Host of the proxy settings in the
  environment options was not saved.

  Sometimes the decimal separator (the point) was reset to
  the preference in the MS-Windows Regional Options. This
  would lead to error messages like
  '0.000 is not a valid floating point value'.

  Renaming the project file without renaming the project
  directory would lead to a rewritten, empty project file.


=== 20 July 2011 ===
Final version of JoinMap 4.1
  (Build: 20jul11.4feb11)

= The only, but very important, enhancement of version 4.1
  of JoinMap is the ability to use the multipoint maximum
  likelihood mapping algorithm on populations of type CP,
  i.e. the outbreeding species full-sib family. The new
  method is described in a paper that was accepted for
  publication:

  Van Ooijen, J.W. (2011). Multipoint maximum likelihood
    mapping in a full-sib family of an outbreeding species.
    Genetics Research, accepted June 2011.


=== 7 February 2011 ===
Maintenance release of JoinMap 4
  (Build: 7feb11.4feb11)

= The Colorize function to show graphical genotypes now
  takes the linkage phases into account for DH and HAP
  population types. For instance, genotype a of a marker
  with phase {1} is shown in the same color as genotype b
  of a marker with phase {0}.

= A function was added to work on the Similarity of Loci
  tabsheet: Population menu > Exclude Similar Loci.
  It works like the Exclude Identicals function, but instead
  of using a similarity value of 1.0 this function prompts
  for a similarity value to use. If two loci have a
  similarity above the given value, the second locus will be
  excluded on the Loci tabsheet, unless the first locus is
  already excluded (to prevent excluding locus C if locus B
  is similar to locus A, and locus C to B but not to A).
  This function allows spatial sampling of the loci.

= The grouping process was given a somewhat higher speed.


=== 6 October 2010 ===
Maintenance release of JoinMap 4
  (Build: 6oct10.9feb10)

= In recent maintenance releases JoinMap was set to use
  Windows Desktop Themes. Several users experienced runtime
  errors due to this. The use of themes by JoinMap is
  stopped.

= Clicking on the 'no data' header of an empty Data tabsheet
  resulted in an 'OLE error' message. This is repaired.


=== 20 April 2010 ===
Maintenance release of JoinMap 4
  (Build: 20apr10.9feb10)

= When creating maternal and paternal population nodes of a
  CP type dataset node, now loci with a <hkxhk> segregation
  type are also exported, unless the classification type is
  (hh,k-) or (h-,kk). The genotypes hk, h- and k- are all
  exported as unknowns --; genotypes hh and kk are exported
  as ll and lm, respectively, for the first (=maternal)
  parent, and as nn and np, respectively, for the second
  (=paternal) parent.


=== 19 Februay 2010 ===
Maintenance release of JoinMap 4
  (Build: 19feb10.9feb10)

= Creating a population node of a CP type dataset node
  resulted in an error. A similar bug resulted with the
  exporting as loc-file from Data tabsheets in minor
  errors in the loc-file. The bugs were repaired.


=== 16 Februay 2010 ===
Maintenance release of JoinMap 4
  (Build: 16feb10.9feb10)

= To make working with large marker datasets of a population
  a bit faster, new options are introduced:
  -A checkbox option on the tool bar controls whether or not
  the various Data tabsheets are loaded; it can also be set
  in the Options menu.
  -Large datasets create huge tables of pairwise linkages
  and if they are not going to be inspected things are
  faster if the tables are left out altogether. Therefore,
  in the Group tabsheet of the calculation options two new
  checkboxes control whether or not weak and strong linkages
  tables are created when the linkages are calculated.

= The Colorize function to show graphical genotypes now
  takes the linkage phases into account (if available) for
  all segregation types except <hkxhk>. For instance,
  genotype lm of a marker with phase {1-} is shown in the
  same color as genotype ll of a marker with phase {0-}. The
  default colors are modified for a better correspondence
  between the segregation types.

= An option is added that controls whether the current
  selection or the entire tabsheet contents must be printed,
  copied, or exported; it is a check box on the tool bar and
  is also available in the Options menu.

= The Highlight Errors function now also allows
  classification types (a,h) and (h,b) for population types
  BCpxFy. And when the y-generation is zero (i.e. it is a
  normal BC1), only genotypes a and h (BCAxFy), or h and b
  (BCBxFy) are allowed.

= With an added option in the Help menu you can now check
  via the internet whether a newer release is available.
  If your internet connection requires the use of a proxy,
  you can supply the proxy name and port in the environment
  options.

= Several internal actions that may take a while now change
  the cursor temporarily into the hourglass cursor.

= Map-files or pwd-files in which the comma is used as
  decimal separator (instead of the point) will be loaded
  correctly.

= Maps with multiple linkage groups are now inverted
  group by group with the Invert Map function of the
  Map menu.

= The time stamp now also shows the seconds.


=== 11 August 2008 ===
Maintenance release of JoinMap 4
  (Build: 11aug08.7apr08)

= In the ML mapping algorithm the fixed order was not always
  maintained; this is corrected.

= The tabsheet with the Locus Means of the Genotype
  Probabilities is sorted on the map position of the loci.
  This will result in a proper chart when plotted against
  the map position.

= The tabsheet with the Individual Means of the Genotype
  Probabilities is given in the original order of the
  individuals.


=== 23 July 2008 ===
Maintenance release of JoinMap 4
  (Build: 23jul08.7apr08)

= If the grouping cannot be calculated for a population
  type CP, better information will now be shown.

= The situation with three (or more) loci at the same map
  position could lead to a floating point error in the ML
  map calculations. This is corrected.

= The cooling control parameter of the ML Mapping algorithm
  had a lower limit of 0.001 which is now reduced to
  0.00001; the upper limit is now set to 1.0.

= The tabsheet with the Locus Means of the Genotype
  Probabilities now also shows the map position of the loci.

= When no project is open, pressing the OK button on the
  Environment and the Calculation Options dialogs will save
  the options as default options that will apply to all
  future projects (similar to the 'Save as default' button).

= The About box was renewed.


=== 8 April 2008 ===
Maintenance release of JoinMap 4
  (Build: 8apr08.7apr08)

= For a BCpxFy the genotype probabilities given the map
  given two heterozygous or dominant flanking markers were
  not completely right. This is corrected.

= The map chart options dialog can be opened when no map
  chart is visible; changing the options will have the same
  effect as 'Save as Default Map Chart Options'. Any future
  map chart will be drawn according to these options.

= Also, when no map chart is visible the 'Reset to Preset
  Map Chart Options' can be activated, which will affect
  all future map charts.

= The loading of MAPMAKER raw data is slightly improved.

= Various minor (internal) improvements were made.


=== 4 May 2007 ===
Maintenance release of JoinMap 4
  (Build: 4may07.4oct06)

Changes:
= JoinMap 4 was enabled to run under Windows Vista.
  For installation of the user license under Windows Vista,
  please see the 'Installation ReadMe' file on the CDROM or
  in the program directory after running the program
  installation 'setup.exe'
  (typically: 'C:\Program Files\JoinMap4').


=== 18 April 2007 ===
Maintenance release of JoinMap 4
  (Build: 18apr07.4oct06)

Changes:
= When exporting the Data tabsheet of a Map node of a CP
  type population as a loc-file, the map position of
  markers was given at the wrong place in the file.
  This is corrected.

= The exporting of a Dataset tabsheet of a Dataset node as
  a loc-file did not function properly. This is corrected.


=== 5 March 2007 ===
Maintenance release of JoinMap 4
  (Build: 5mar07.4oct06)

Changes:
= When calculating the linkages for groups of population
  type CP, it is possible that the linkage phases cannot
  be determined and thus also no recombination frequencies
  can be calculated. In such instances the program could
  generate an unclear runtime error message: 'unknown error
  in sclastype()'.
  This problem is corrected and the information given in
  the 'Info on Tabsheet Contents' has become more complete
  about the linkage phases determination status.


=== 4 October 2006 ===
Maintenance release of JoinMap 4
  (Build: 2oct06.4oct06)

Changes:
= For extremely large values of the chisquare distribution
  the P-value in the Grouping tabsheet could not be
  calculated and resulted in the freezing of the program.
  The P-value is calculated irrespective of the Grouping
  parameter chosen.

  A new algorithm to calculate the P-value is now used.

= For very large linkage groups the computations of the
  linkages may appear to take extremely long. Actually,
  it is not the computations that take a long time but
  the loading of the resulting data into the Linkages
  tabsheets. For such large linkage groups there may
  be very, very many pairs to display on the Weak and
  Strong linkages tabsheets, depending on the chosen
  corresponding thresholds.

  To allow for more precision here, the recombination
  frequency thresholds on the Group tabsheet of the
  Calculation Options now have up to four decimals.

  Unfortunately the loading of the data into the
  tabsheets cannot be shown on the progress bar, but the
  progress of the program is now shown with some simple
  comments on the status bar:
    'loading table "Weak Linkages"'
    'loading table "Strong Linkages"'
    'loading table "Suspect Linkages"'
  together with the numbers of rows that must be loaded,
  allowing the user to see and estimate the progress.
  These comments are usually only visible with very large
  groups.


=== 25 July 2006 ===
Final edition of JoinMap 4
  (Build: 25jul06.16jun06)