Lacking the feature, I wonder if this might work?
Write either a SCRIPT or EXE that will send an ON to a "dummy module". Use the WINDOWS SCHEDULER to execute your SCRIPT or EXE on 15 minute intervals. Respond to the ON signal from the DUMMY MODULE by doing the stuff you want to do in AHP. If some is OUTSIDE of AHP then have your script or exe do some or all of the work.
If you are not familiar with the scheduler, run control panel, find SCHEDULED TASKS. Click ADD SCHEDULED TASK. a WIZARD pops up. You may need to browse to your script or exe. Choose DAILY. Take defaults for the rest, except the LOGON information of course. IMPORTANT: pick OPEN ADVANCED PROPERTIES FOR THIS TASK WHEN I CLICK FINISH, and then click FINISHED. Click the ADVANCED BUTTON. click REPEATING TASK. You can choose EVERY 15 MINUTES. Basically you are requesting schedule action each day, so start it at 1 minute past midnight, repeating every 15 minutes, and the duration should be like 23:58 so it is doing the 15 minute triggers all day every day. I know its confusing, but that's the way it works (at least on XP). There is ALSO a saftey feature here that if the task is NOT done in 15 minutes to stop the daily event (no more repeats) if you choose. If your application errors (maybe the disk is full), and throws up an error dialog, the application won't end itself normally, so think about this.
Just a thought.