+---------------------------------+
|       SYS(22 [, <expN>])        |
+---------------------------------+

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Returns name of master controlling tag or index for a database.
Return value - Character
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The master controlling tag or index is returned for the currently
selected work area unless another work area number <expN> is included.

For more information about the master controlling tag or index, see the
USE, INDEX and SET ORDER commands in this help facility.

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See Also:  CDX(), KEY(), INDEX, MDX(), NDX(), REINDEX, SET INDEX, SET
ORDER, SYS(), SYS(21) Master index number, TAG()

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