Stop Read SF

3270 5250 VT
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The Stop Read SF function ends a client application's ability to read structured field data.

The client sends the following command to perform the Stop Read SF function. 
PostMessage( hServerWnd,
             WM_DDE_UNADVISE,
             hClientWnd,
             MAKELPARAM(NULL, aSF) );
where:
aSF
Identified structured field as the item.