Linking to the very last post in a thread

[gopherhockey]

I need to be able to link to the last post in a thread. Not the last unread post, but the last item posted... the link needs to work regardless of how a user has their post order sorted, or if the user is not logged in.

Currently I use something like showthread.php?t=9180#post3107513

where post = larger number than the number of posts in a thread.

However, this link goes to the first post for some users and non-logged in users.

This is a link from a non php page. If there is a way to do it via php I am willing.

THanks.