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  Sx_TagCount():

  Syntax:   Sx_TagCount([cIndexFileName | nIndexFileOrder])

            cIndexFileName  = Name of Index file (order bag)
            nIndexFileOrder = Position of FILE in Index FILE list.

  Returns:  <numeric> Number of tags in the current or specified
            index (order bag). 0 if the order is invalid, no index is open,
            or if the current order is 0 and no parameters were passed.

  Description:   This function returns the number of tags within the
                 current or specified index.  If the current or specified
                 index is an .IDX then Sx_TagCount() will return 1.

    NOTE:  This function is NOT supported under SIXNTX.

  Example:

    #include "SIXCDX.CH"

    USE test VIA "SIXCDX"             // Open database
    INDEX ON last TAG last            // Create one tag
    ? Sx_TagCount()                   // Returns: 1
    INDEX ON state TAG state          // Create a second tag
    ? Sx_TagCount()                   // Returns: 2
    Sx_KillTag( "LAST" )              // Delete tag number 1 (LAST)
    ? Sx_TagCount()                   // Returns: 1