With RPM version 482, the only option to restrict access to a particular account is to use Account Masks, available from the SETTINGS | DELEGATION menu of the management console. Here you will filter the the accounts that a particular entity can see. For example, to show all accounts that begin with the word admin, the account mask would be admin*. Your second option is to use the Self Recovery Rules where you can expressly map out a particular account on a particular system that a particular entity can check out. Self recovery also has to be turned on as a website option to enable the feature to work.
In the forthcoming RPM - post version 482 - there will be a "Per Account Delegation" where you will be able to delegate that a particular account can be recovered or requested, etc.
Support
support@liebsoft.com
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http://www.liebsoft.com
Main: (800) 829-6263
International: +1 (310) 550-8575
Fax: (310) 550-1152