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DB4PPSRC.EXE
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_USED.PRG
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1993-05-04
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FUNCTION _Used && Determine if a DBF is Open in Target Work Area
PARAMETERS p__alias
*-------------------------------------------------------------------------
* NAME
* _Used - determine if alias in use, SELECT it if so.
*
* SYNOPSIS
* _Used( p__alias )
*
* DESCRIPTION
* The _USED() function returns true (.T.) if a
* database is open in the work area identified by
* <expr>. In this case, the specified work area
* is also SELECTed by _USED() before it returns.
*
* <expr> may be a work area alias, number
* or letter. _USED() returns .F. if no database
* file is open in the specified work area, and
* the current work area remains unchanged.
*
* EXAMPLES
*
* SELECT A
* USE Client
* SELECT B
* USE Items
* SELECT C
* USE Brett
* ? _USED(1)
* .T.
* ? _USED('B')
* .T.
* ? _USED('BRETT')
* .T.
* ? _USED(4)
* .F.
*
*-------------------------------------------------------------------------
*-- Check for the alias with the 1.2 SELECT()
IF SELECT( m->p__alias ) > 0
SELECT ( m->p__alias )
RETURN .T.
ELSE
RETURN .F.
ENDIF
*--EOF: _Used( p__alias )