This library makes it possible to start multiple cron based timers in your script: Download cron library.
To use it place cron.ahk in your standard or user library (%A_ProgramFiles%\AutoHotkey\Lib or %A_MyDocuments%\AutoHotkey\Lib) and create a new cron timer:
; cron_insert(minutes, hours, days, months, daysofweek, target [, workingdir]) cron_insert("0,15,30,45","*","*","*","*","notepad.exe") ; Each entry can be a commaseparated list of values or * for all ; The example above imply that notepad.exe is being started each 15 minutes, ; every hour, every day and every month. ; For the daysofweek parameter 0 is sunday, * isn't expanded to every weekday
Still need some polishing and testing ;-)