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  Sx_TagUnique():

  Syntax:  Sx_TagUnique([[nTagNo | cTagName,] nOrder | cIndexName])

           nTagNo     = Position of tag within compound index file
           cTagName   = Name of the tag
           nOrder     = Position of index in list of indexes
           nIndexName = Name of the index

           If no tag name or number is specified, the currently active tag
           is assumed.

  Returns:  Logical value.  .T. if the tag was created UNIQUE, .F. if not.

  Description:  This function simply allows you to find out the UNIQUE
                status of a particular tag.

    NOTE:  This function is NOT supported under SIXNTX.

  Example:

    #include "SIXCDX.CH"

    USE test VIA "SIXCDX"
    INDEX ON last  TAG last UNIQUE
    INDEX ON state TAG state
    INDEX ON age   TAG age

    ? Sx_TagUnique( 1 )        // Returns .T.
    ? Sx_TagUnique( 2 )        // Returns .F.
    ? Sx_TagUnique( 3 )        // Returns .F.
    ? Sx_TagUnique( "LAST" )   // Returns .T.