source versions for multiple machines

[Leslie Mikesell]

Are there any simple methods to maintain sources to keep versions
on several machines up to date?  I will do most editing on an 80386
machine with RFS links to 3B2's and the ability to access the same
files from DOS under VP/ix or over the network from a different PC,
so up to 3 binaries may be produced from the same physical copy of
the sources.  I also will need to transport copies to a 3B1 and
possibly other machines via uucp or floppies.  Is there a reasonable
solution to keeping everything syncronized and maintaining current
archive copies of everything?

Les Mikesell