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METHOD GetDC CLASS TWindow
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TWindow:SendMsg( <nMsg>, <nWParam>, <nLParam> )  -->  nSucces

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 SendMsg() method places a API message in the message queue of
the window and waits 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.