Sun OS 4.0.3 : Finding the name of the file a process is executing

[Mark Nichols]

Can someone explain how to track down the file that a given process is
executing under Sun OS 4 or 4.3 bsd ? All the examples I have are for 
4.2 bsd and are no longer valid under 4.3.

Thanks

Mark 
mnichols at psivax.psi.siemens.com