Function 3Eh Close A File Handle Close a file and release handle for reuse entry AH 3Eh BX file handle return flag CF 0 successful close 1 error AX error code if error (6) note 1) When executed, the file is closed, the directory is updated, and all buffers for that file are flushed. If the file was changed, the time and date stamps are changed to current 2) If called with the handle 00000, it will close STDIN (normally the keyboard). 3) recent versions of DOS preserve AH because some versions of Multiplan had a bug which depended on AH being preserved
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