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DefWindowProc()
Pass a message to the default window procedure
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Syntax
DefWindowProc( <hWnd>, <nMsg>, <nwParam>, <nlParam> )   -->   nResult

Arguments
<hWnd> is the handle to the window.

<nMsg> is the message (one of the WM_* values defined in
WINDOWS.CH).

<nwParam> depends on <nMsg>.

<nlParam> depends on <nMsg>.

Returns
A numeric value, returned by the default window procedure.

Description
This is the "traditional" way to program Windows applications.
It is allowed (but not required) with Clip-4-Win, but is not
necessarily the easiest way to program.

To use a window procedure, you register a window class with a
code block to act as a window procedure.  When you create a
window and subsequently get sent messages, you can use this
function to pass unwanted messages along to the default window
procedure.

Example
See source\odraw.prg.