MsgControlHook Parameter - idContext

idContext (LONG) - input

Origin of call to hook.

MCHK_CLASSMSGINTEREST

WinSetClassMsgInterest
MCHK_MSGINTEREST
WinSetMsgInterest
MCHK_MSGMODE
WinSetMsgMode
MCHK_SYNCHRONISATION
WinSetSynchroMode

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