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Hello

This answer is not correct.
The question was how to set the timeout for SendRequest(), but INTERNET_OPTION_CONNECT_TIMEOUT sets the timeout to CONNECT the server.

So you should set...

Hello

You will also get problems when you try to call the OleAcc.Dll functions
AccessibleChildren() and AccessibleObjectFromPoint()

If you try to do this in C# I promise that your code will...

Hello

In your code the cleanup is completely missing.
But even if I add the three missing
Marshal.FreeCoTaskMem(...);
the code will have a strange behaviour :

When I call it once, it...