TOOL TO UNDELETE DELETED Oracle RDBMS/DB USERS

it seems to be impossible to 
undelete deleted users without restoring the DB 
is there however a undocumented (unsupported) workaround ?
As it is very likely, this will happen ...


Can you pls Try Oracle PRM-DUL recovery TOOLS?

It can be download here : http://www.parnassusdata.com/en