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|             HEADER              |
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HEADER([<expN> | <expC>])

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Returns size of database header.
Return value - Numeric
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The HEADER() function returns the number of bytes in the header of the
database open in the work area identified by <alias>.  Specify a
database alias or work area letter (work area letters A through J for
the first ten work areas only) or specify the work area number.  If you
specify an alias or work area letter it must be enclosed in single or
double quotes.  If the <alias> is omitted, the current work area is
assumed.

Zero is returned if no database is open in the specified work area.

You can use HEADER() with the DISKSPACE() and RECSIZE() functions to
determine if there's enough room on the disk for operations such as
SORT, INDEX or COPY.  HEADER() is also useful with low-level file
functions.

Clauses
-------

<expN> | <expC>
        Optional work area number or alias.

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See Also:  FSIZE(), RECSIZE()

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