Futurebasic/Language/Reference/write field

Syntax
WRITE FIELD[#] deviceID, handle&amp;

Description
Use this statement to write the contents of the relocatable block specified by  to the open file or serial port specified by , in a format suitable for input by the   statement.

starts writing at the current "file mark" position. If first writes a 4-byte long-integer which indicates the size of the block; following this, it writes the contents of the block itself.