Windows Mobile thread scheduling

I have an issue about Windows Mobile thread scheduling: I have an application (C#) that detects incoming calls on the telephone. It is said that the operating system is "fully multitasking and multithreaded".

Still, I can detect an incoming call, but after the call is detected, the system application, showing that there is a call incoming, takes over the focus.My application doesn't get to execute itself until the syste开发者_JS百科m window (with the call) is deactivated. (something happens with the call).

Is there anything I can set so that my thread (application) executes even when the system window is focused?

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All solutions you can come up with for this are based on one thing: a hack. Windows Mobile is not meant to be customized as you wish - Windows CE is. You cannot override the default Windows Mobile phonecall UI, but you can put your own app above it with the correct API calls. However, it will flicker and it will look like s...t.