what does it means(just an explanation)?

I got a trick to use WaitForInputIdle in my last question from Wyn(an expert here).
I get below from SDK:
WaitForInputIdle
The WaitForInputIdle function waits until the given process is waiting for user input with no input pending, or until the time-out interval has elapsed.

My quesition is what indeed "no input pending" means above?

It means no message in message queque or what?

Plz comment and I will judge soon.

Appreciate your help.
Thx.
bb_2000Asked:
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wardkdConnect With a Mentor Commented:
This call will return if
1. The delay time expires
2. An error occurs
3. The process has reached a point in it's execution when it is waiting for input and no keyboard or mouse messages are in it's queue
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alexoCommented:
I think no inbound window messages in the queue
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