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 Returns the size of an open file (bytes), the number of records in an ISAM
 table, or when used with the OPEN COM statement, the number of bytes free
 in the output buffer (ISAM available in Professional Edition only).
 
    LOF(filenumber%)
 
    ■ filenumber%       Number specifying an open file or ISAM table
 
 See Also
    ◄EOF Function►                     ◄LEN Function►
    ◄LOC Function►                     ◄OPEN Statement (File I/O)►