new version of chapter four

Marc Snir (snir@watson.ibm.com)
Thu, 15 Aug 1996 23:58:37 -0400

Postscript comes in next message. I added the corrections suggested by
Rolf, and many examples. The synchronization calls have now info arguments,
to indicate what protocol is needed.

I have no access to email, for a week. My aplogies for unanswered email, if
any.