FRE                      Available Memory

 y = FRE({strexpr | numexpr})

    Returns the number of bytes available in QuickBASIC's string space;
    optionally forces a defragmentation of the string space.

     strexpr    A dummy argument; the actual value is inconsequential.
                FRE(strexpr) causes QuickBASIC to clean house on its
                string data space, then report the amount of free space
                available.

     numexpr    A dummy argument. If numexpr = -1, QuickBASIC reports the
                size in bytes of the largest free LNA (large numeric
                array) entry. If any other value is used, QuickBASIC omits
                the housecleaning step and reports the amount of free
                space available.