View delegate report & revoke back?

Greetings all,

I'd like to check for delegation permission for user/group in AD.

Let say previous admin has assigned delegate permission to security group HelpDesk to reset user password.

I would like to know what other permission are being delegated to this group, and/or other group is this possible to achieve?

2. And also, once the delegation permission is granted, is it possible to revoke back?

Thanks in advanced for kind advice.

regards,