POST places a Clarion event to the event queue of the top WINDOW of the current (if the 3rd parameter is omitted) thread or of the thread identified by the 3rd parameter if it is passed.
PostMessage, SendMessage, etc. are functions working with Windows messages and message queues of User objects of specific type (windows). Nothing in common.
How POST places events to an event queue in another thread depends from event and from Clarion version. In some cases the RTL uses the SendNotifyMessage API function for that.
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