minor hack to pmachine cms

i use pmachine ([login to view URL]) to run my site - [login to view URL] - but i'm having a difficult time figuring out a minor hack. within the discussion forum - [login to view URL] - i need to display the name of the member who has most recently posted to a discussion instead of the person who started the discussion. within one of the back-end files (i know which one this is), i need to create a new variable that i can use in my pmachine templates to show the most recent poster's name. This needs to be an additional variable. i need to keep the existing topic starter's name variable for other parts of the website. pmachine is open source and is coded in php in conjunction with a mysql database. ## Deliverables 1) Complete and fully-functional working script/hack to existing php file. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform unix, php, mysql