Verify Piipe Exists

I am trying to install a vendor application with an Oracle repository = and not making much progress. The install has failed and the cleanup = requires that the pipe be purged and removed or the database be bounced. = I've been through this four times since Friday afternoon. I can't find = any way to view whether or not a pipe exists. I know its not a = conventional database object and that its some sort of memory structure. =  Is there a way to do this? Where do I look?

This is what they gave me to remove the pipe.

declare ret number;=20
begin=20
dbms_pipe.purge('usernamePIPE_MASTER');=20 ret:=3Ddbms_pipe.remove_pipe(user||'pipe_master1');=20 end;=20

Don Freeman
Database Administrator 1
Pennsylvania Dept of Health
Bureau of Information Technology

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