cvs - version 1.10
     (Unixware 1, xenix  version 1.09)

     cvs is a front end to the  rcs(1)  revision  control  system
     which  extends the notion of revision control from a collec-
     tion of files in a single directory to a  hierarchical  col-
     lection  of  directories  consisting  of revision controlled
     files.  These directories and files can be combined together
     to  form  a  software  release.   cvs provides the functions
     necessary to manage these software releases and  to  control
     the  concurrent  editing  of  source  files  among  multiple
     software developers.