Foreground Applications

Is there a way to NOT make an application become foreground?
But still be able to get user input?
Like maybe, whenever my program is foreground,
make Desktop become foreground?

>>8
Hi, thanks for your feedback and idea :)
I'm sure your method will be able to work,
and I will probably try it out in coming days.
But I worry in advance that it may not be the most effecient way
because the whole reason for me wanting to do this
(treating my foreground window as a background window)
is to avoid Windows boosting its priority, which UNFORTUNATELY causes my realtime program to run slower instead of faster.