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

Arguments
<hWnd> is the handle to the MDI child 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 MDI child window
procedure.

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

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

Example
See source\mdismall.prg and source\mdidemo.prg.