IIS Interacting with desktop (php exec)

[Anon]

Hi,
I have a programmed execed by php's exec function, the problem is that in this function

HWND hwndWinamp = FindWindow("Winamp v1.x",NULL);

the executed program cannot get hold of Winamp since its in a different service. Setting the appopriate serives (WWW Publishing, IIS Admin) to 'Allow this service to interact with The Desktop' does not change anythings. Am I missing something?

Nige