The WH_MOUSE hook enables you to monitor mouse messages about to be returned by theGetMessage orPeekMessage function. You can use the WH_MOUSE hook to monitor mouse input posted to a message queue.
For more information, see the MouseProc function.
[New for Windows NT 4.0 Service Pack 3.]
The WH_MOUSE_LL hook enables you to monitor mouse input events about to be posted in a thread input queue.
For more information, see the LowLevelMouseProc function.