+---------------------------------+
|              USED               |
+---------------------------------+
USED([<expN> | <expC>])

-----------------------------------
Returns true if a database is open in a specified work area.
Return value - Logical
-----------------------------------

USED() returns a logical true value (.T.) if a database is open in a
specified work area.  If a database isn't open in the specified work
area, USED() returns a logical false (.F.).

<expN> | <expC>
        If you don't specify a work area or alias, the currently selected work
area is checked for an open database.  To test for an open database in
another work area, include the work area number <expN>, or the database
alias <expC>.

        If you specify an alias, USED() returns true if a database with the
specified alias is open in one of the FoxPro work areas.

+---------------------------------+
|            Example              |
+---------------------------------+
CLOSE ALL
SELECT A
USE customer
SELECT B
USE items
SELECT C
USE salesrep

? USED(1)

? USED('B')

? USED(4)

* The following example checks to see whether the INVOICE database is
* in use.  If it is, its workarea is selected; otherwise the database is
* opened in the first available area.

IF USED('INVOICE')
   SELECT invoice
ELSE
   SELECT 0
   USE invoice
ENDIF

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See Also:  ALIAS(), SELECT

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