EXPORT/IMPORT are utilities at OS level just like SQL*Plus utility. You basically invoke these utilities at OS command line.
exp/imp nothing to do with Sqlplus at all.

With SQL*Plus you run Sql commands.
With exp/imp you take the whole database into a dump file and import it to where you want.

Seems you are confused. I take back that.
I was confused with the words usage.

As others said you can use

exp system/****@xyz
imp system/****@xyz



[Edited by sreddy on 02-01-2001 at 01:43 PM]