command-line access ?

Hi ! We are using NT/IIS4 and IMail as a Mailserver. We are working on a service-interface, and we want to give the chance, using the interface, to add/delete/modify mail-accounts. There is command-line stuff with IMail, but how do I use it with php ? Example: I would use the exe-files at the dos-promt: C:\>adduser -h host.com.... How do I do that with php ? Jan-Hendrik (.de)