I would expect that EG is downward compatible with prior versions, regardless of where running (server or local install). Also, given that SAS version 8 is stabilized, you would be encouraged to upgrade to a "supported, maintained" SAS version for your enterprise SAS applications.
Thank you for your responses Scott and Doc. Doc, just curious do you work for SAS ? The reason we didn't install the Enterprise Guide 4.1 was because we found a bug in SAS 9.1.3 (sp4) in that when we terminate the PC sas session, an orphan process would spawn and run forever on our unix sas 9.1.3 server back in 2007.
We asked SAS to fix it but we were too busy to follow up with the work and co-ordination required.
I wrote a korn script on the unix server to just kill any long running sas processes with over 90 minutes CPU time and no updates to saswork directories currently. The problem was also diagnosed as SAS 9.1.3 files being left open when the session is terminated without sign off. We created a sign off button to fix this but difficult to enforce users to always remember to sign off before terminating the PC sessions.
If you know of any similar reported problems, please let me know.