How to restrict user's access to R12 application

Hii
How to restrict few users to access my  R12 (12.0.6) EBS applications 
temporarily, as I dont want to get into the process of disabling or re-setting 
the passwords because of having a large number of users. I have R12 (12.0.6) 
configured in multi-node fashion under Redhat Linux 4.6 AS with 10gR2 database.

I shall be grateful for sharing the information.
 Sincerely,
 
Imran Kiani


      

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