Boot WLS 9.1 Administrative Console

Hello everybody,

Glad to see I'm still marked as a Greenhorn. Someone in our group lost a memory
stick loaded with our passwords and so we are going through changing them.

After changing a WebLogic 9.1 Administrtive Server password for Admin user X I
decided to add a new user Y with the <default properties>, same as user X
and then delete user X. 

This didn't work as you could have guessed, seems i left a step out somewhere.
Now user X doesn't exist and so I can't boot the Administrative Server as user Y
doesn't have the rights.

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On my attempts to do so I get this BEA system error message:

<BEA-090404>

Critical: User userName is not permitted to boot the server; The server policy
may have changed in such a way that the user is no longer able to boot the
server.Reboot the server with the administrative user account or contact the
system administrator to update the server policy definitions.

Description
	The user userName has not been granted the necessary permission to boot the
server.

Cause
	The server policy may have changed in such a way that the user is no longer
able to boot the server.

Action
	Reboot the server from the administrative user account or contact the system
administrator to update the server policy definitions.

*****

Question: How do I edit these 'server policy definitions' without an admin
server console or even an admin server running? (e.g. vi)