MMHOME is different for different people. It points to the root
directory of the individual's sccs hierarchy. So, if your local sccs hierarchy
is located at ~szekely/mm-proj, then MMHOME will be ~szekely/mm-proj. Rccs
get all the files from the common sccs hierarchy into the local sccs
hierarchy. The root directory for the common sccs hierarchy is defined
in the file "~mm-proj/.rccsrc".
-jk