Procmail and aliases ?

        Hi.

I have system with users without home dirs and shells.
They only have mailboxes in /var/spool/mail. 
Can i run procmail from sendmail aliases file ? 

(user: "|procmail procmailrc")

        Can some users, for which i will run procmail from
aliases, share one identical procmailrc file ?

        Thank You in advance.

                                Petr Brehovsky
                                breh(_at_)pvt(_dot_)net