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  Sx_IndexCount():

  Syntax:   Sx_IndexCount()

  Returns:  A numeric value containing the number of index files open in
            the current workarea.

  Description:  Returns the number of index files that are open for the
                database in the current workarea.  This number includes the
                structural .CDX, if one exists.

    NOTE:  This function is NOT supported under SIXNTX.

  Example:

    #include "SIXCDX.CH"

    // Assume that TEST.DBF also has a structural index (TEST.CDX)

    use TEST via "SIXCDX"       // Open TEST.DBF and TEST.CDX
    ? Sx_IndexCount()           // Returns 1

    SET INDEX TO foo, bar       // Also open FOO.IDX and BAR.IDX
    ? Sx_IndexCount()           // Returns 3

    SET INDEX TO                // Close all indexes except TEST.CDX
    ? Sx_IndexCount()           // Returns 1

    SET INDEX TO foo            // Open FOO.IDX
    ? Sx_IndexCount()           // Returns 2

    SET INDEX TO bar ADDITIVE   // Open BAR.IDX
    ? Sx_IndexCount()           // Returns 3