about a process and the process that spawns it (win32/C)

I have an app that will usually be spawned by another app. The UI and behaviour will vary a bit depending on whether the said app was opened directly by the user or spawned. How can I determine if it was launched by the user or spawned?

I have a couple of ideas but they don't seem doable.

1. If there was a way of sending extra app 开发者_如何学Pythonspecific param via CreateProcess() this would be simple but I can't find how to do that.

2. If I can find the handle of the parent process, I can determine if it was spawned or not but I can't see how to do that.

Please help!

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If there was a way of sending extra app specific param via CreateProcess()

So you have control of the invoking application? If so surely this is what command lines are for?

CreateProcess( NULL, "C:\\app.exe /launched_by_app2" ...)