Program name from PID?

[Bob Celmer]

Hello Everyone:

Given a process id, how can I find out the name of the process it belongs
to?  Unfortunately, grepping ps output is not a viable option.  The specific
system is Xenix 2.3.2 running on 386 based machines.  Also, how might this
problem be solved on other Unix platforms?

Thanks.
-- 
Bob Celmer
UUCP: {fedeva,chromc}!dynasys!rscsys!bob

Disclaimer:  Al Gore and Jim Sasser seldom represent MY views...