[fanf2]

CVS was called the “concurrent version system” because it did not lock files on checkout. Nor did svn. Perforce does.

[ack_complete]

Perforce does not lock files on checkout unless you have the file specifically configured to enforce exclusive locking in the file's metadata or depot typemap.

[rswail]

True dat, my mistake. That was its major feature, from memory though it still used the same reversed diff file format?