automatic unique key genration

Does anyone know if oracle supports automatic key generation. I would like to have the primary key generated automatically as part of a trigger whenever a record is inserted. I know that some databases have this object/function built in as part of their SQL extensions.

My company is moving to client/server and this feature would be nice.

Thanks for any info.

Mike

Michael Hollingsworth                                mholling_at_nova.umuc.edu