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                 ISAM available in Professional Edition only
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 Tests whether the current position is at the beginning of an ISAM table;
 returns True (nonzero) if the current position is before the first record
 according to the current index. Requires PROISAM.EXE or PROISAMD.EXE in the
 programming environment (VBDOS.EXE).
 
    BOF(filenumber%)
 
    ■ filenumber%   Number used in the OPEN statement to open the table;
                    integer expression with a value between 1 and 255,
                    inclusive
 
 See Also
    ◄EOF Function►                     ◄ISAM Database Development►
    ◄LOC Function►                     ◄LOF Function►
    ◄OPEN Statement (File I/O)►        ◄PROISAM Command-Line Options►
    ◄PROISAMD Command-Line Options►