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DDEUnAdvise()
Turn off being advised about changes to a DDE data item
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Syntax
DDEUnAdvise( <hWndServer>, <hWndClient>, [ <nFormat> ] , [ <cItem> ] )
              -->   NIL

Arguments
<hWndServer> is the handle of the server window.

<hWndClient> is the handle of the window wanting to stop being
advised.

<nFormat> is an optional integer specifying the format of
data.  Use one of the CF_* values defined in WINDOWS.CH, which
are explained in the GetClipbData() function.  (Default:
CF_TEXT.)

<cItem> is an optional string specifying the name of the item.
(Default: all or default, depending on the server.)

Returns
NIL.

Description
This function can be used to tell a server not to keep
informing the client of changes in the data.

This function is provided in the \clip4win\source\dde.prg file.

Example
DDEUnAdvise( hWndServer, hWndClient, CF_TEXT, "Item1" )