uscmd (USHORT)

Command value.

It is the responsibility of the application to be able to relate uscmd to an application function.

ussource (USHORT)

Source type.

Identifies the type of control:

CMDSRC_PUSHBUTTON

Posted by a push-button control. uscmd is the window identity of the push button.
CMDSRC_MENU
Posted by a menu control. uscmd is the identity of the menu item.
CMDSRC_ACCELERATOR
Posted as the result of an accelerator. uscmd is the accelerator command value.
CMDSRC_OTHER
Other source. uscmd gives further control-specific information defined for each control type.

uspointer (USHORT)

Pointer-device indicator.

TRUE

If the message is posted as a result of a pointer-device operation
FALSE
If the message is posted as a result of a keyboard operation.

ulReserved (ULONG)

Reserved value, should be 0.

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