[Zope3-Users] Grant Principals in Bulk

[djohnson at jsatech.com]

What is the easiest way to grant access to a group of principals? I am
building an AuthenticatorPlugin that authenticates users against an
relational database.  Do I have to do a specific grant on each principal? 
I want all the principals to be granted a specific permission if they are
authenticated via the AuthenticatorPlugin I am creating.