The WaitMessage function yields control to other threads when a thread has no other messages in its message queue. The WaitMessage function suspends the thread and does not return until a new message is placed in the thread's message queue.

C# Signature:

[DllImport("user32.dll")]
static extern bool WaitMessage();

VB Signature:

Declare Function WaitMessage Lib "user32.dll" () As Boolean

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Notes:

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Documentation

WaitMessage on MSDN

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