TB_PreviousKey()
 Reset the STDBrowse() to the previous set of data.
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 Syntax:

     TB_PreviousKey( <oBrowse> ) --> NIL

 Arguments:

     <oBrowse> is the current STDBrowse() object.

 Returns:

     TB_PreviousKey() always returns NIL.

 Description:

     TB_PreviousKey() can be called from within a menu codeblock used in
     a STDBrowse().  It will reset the STDBrowse() to the previous logical
     data set defined by the key used to index the database file.  As an
     example, if the current database in use is indexed by province code and
     the current data set is limited to "ON" the next data set selected would
     be "NS".


 Files:  Library is CUACLIP.LIB.