Domain Admin Accounts---"Firecall Account"

Domain Admin Accounts---"Firecall Account"

We recently purchased PMP and one of the things I'd to with it is store an Emergency Enterprise Admin account in it.  I would like for PMP to automatically change the password on this account after the person has checked it back in.  Where would I look for instructions on how to do this?  This account isn't associated to any particular machine but would primarily be used to AD changes on the Domain Controller.