This subdirectory formerly contained tools that can be used with CVS. In particular, it used to contain a copy of pcl-cvs version 1.x. Pcl-cvs is an Emacs interface to CVS. If you are looking for pcl-cvs, we'd suggest pcl-cvs version 2.x, at: ftp://ftp.weird.com/pub/local/ The following CVS site has a page about pcl-cvs: http://ximbiot.com It also has much information about CVS tools more generally.