Backgrounding PHP

Hi all. I'm new to php on Windows and to this list. This is probably a really basic question for most of you, but I've searched the web for hours trying to find an answer. Hopefully somebody here will be kind enough to clue me in. Here's the question... When running a php script from the task scheduler, how do you keep the "mtask" window from popping up every time the task runs ? Is there a command line witch for php.exe for this, or something just as simple ? Thanks for any help, Cary