I don't know about old versions of OEM. AFAIK, with 2.x versions OEM client is NOT integrated with Oracle Client. Two clients will be in two seperate homes with seperate Networking. You have to copy the Oracle Client tnsnames.ora to OEM networking home to connect to all the databases you are accessing from SQL*Plus.

[Edited by sreddy on 01-30-2001 at 05:03 PM]