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tbSetKey()
Sets the filter condition
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Syntax:

     tbSetKey( <oTbr>, [<nTbOrd>],;
               [<bTbKey>], [<bTbFlt>], [<bTbBrk>] ) --> NIL

Parameters:

     <oTbr>     tBrowse object
     <nTbOrd>   Set order to. If not specified, the current index will be
     used.
     <bTbKey>   Key expression. Default NIL.
     <bTbFlt>   Filter expression. Default NONE.
     <bTbBrk>   Break condition. Default NONE.

Returns:

     NIL

Description:

     Updates the conditions that specify what records are displayed in the
     object. If the current record does not satisfy the specified
     conditions, the file will be positioned on the 1st record that
     satisfies them.

Example:

     // create a new tBrowse
     LOCAL oTbr := tbBrwNew( 3, 10, 13, 75 )
     // ...
     // Set the TBrowse to display all invoice rows that
     // belong to the same invoice header
     tbSetKey( oTbr                               ,;
               1                                  ,;
               {||InvHea->InvCod                  ,;
               {||InvRow->InvCod==InvHea->InvCod} ,;
               {||InvRow->InvCod!=InvHea->InvCod}  )

See also:

     tbBrwNew()