I've been trying to write a program using the object API but have found out
that one thing I need to do can't be done with that and was wondering if
this can be done with tokens.

Basically, I have groups in a personal address book. Some of the group
members have been deleted completely out of the personal address books, but
the entries are still in these groups. Is there any way to modify the email
addresses of these entries in the groups if there is no address book entry
for them? I was told that this isn't possible with the object API.