In Lyx versions 1.6.8 and higher there is a version control toolbar.
I successfully got RCS working but I cannot find any information on how to use SVN.
However, there always is an "use SVN" button which is greyed out.
I added the bin directory of a slicksvn installation to the PathPrefix in the Lyx options as well as to the Path environment variable of WinXP, which is my operating system.
I saved preferences, reconfigured and restarted Lyx but SVN won't work.
How to get SVN up and running with Lyx?