<post_win_msg> Posts Windows message (the same as PostMessage Windows API call).   (This command is intended for Windows programmers and experts.)

Command Tree:   System  \  Post Windows Msg
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Syntax:   <post_win_msg>(Win, Msg, WParam, LParam)
Win
Can be either:
1 - Window title (partial string).
2 - Variable.
3 - Window handle (decimal number).
Msg
Windows message ID (decimal number).
WParam
WParam parameter of the Windows message (decimal number). 
LParam
LParam parameter of the Windows message (decimal number).
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Example:   <#> This macro will start playing in WinAmp (the same as clicking on the "Play" button).
<#>
<post_win_msg>(winamp, 273, 40045, 0)