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METHOD PostMsg( ) CLASS TWindow
Post an API message in the window's message queue
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TWindow:PostMsg( <nMsg>, <nWParam>, <nLParam> )  --> nRetVal

Parameters:

<nMsg>      This parameter should contain one of the MS-Windows API
            'messages'. The values are defined in WINAPI.CH.

<nWParam>   The value of this parameter is directly related to the
            value of <nMsg>. This should be a 16 bit integer.

<nLParam>   The value of this parameter is directly related to the
            value of <nMsg>. This should be a 32 bit integer.

Purpose:
The PostMsg() method places a API message in the message queue of the
window and does not wait for the window to process the message. It can
be used to influence the behavior of the window.  However the sending
of messages can be very dangerous for your application if it is not
done properly.  Before you use the PostMsg() method be sure of what you
are doing, which message you are sending and what the values should be
of the related parameters.