How to use Beyond Compare as 3rd parth tools for CVS products

Subversion

Windows
1.Go into the Beyond Compare installation folder (eg, C:\Program Files\Beyond Compare 3).
2.Create a batch file named "svn.bat" with one line:
"C:\Progra~1\Beyond~1\bcomp.exe" "%6" /title1=%3 "%7" /title2=%5
3.Go into Subversion's per-user configuration area, typically C:\Documents and Settings\\Application Data\Subversion.
4.Edit "config" and change the following lines:
# [helpers]
# diff-cmd = diff_program (diff, gdiff, etc.)
to:
[helpers]
diff-cmd = C:\Progra~1\Beyond~1\svn.bat

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AnkhSVN
1.Open Visual Studio.
2.Select Options from the Tools menu.
3.Select Source Control Subversion User Tools.
4.For the Diff and Merge entries, select Beyond Compare from the dropdown.

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The full article can be seen here:
http://www.scootersoftware.com/support.php?zz=kb_vcs.php