Category: <b>DOS kernel</b>
<br>Flags: Undocumented function<p>
<pre><b>INT 21 - MS-DOS 7.0+ - CONFIG$ device - SET??? CONFIGURATION INFORMATION</b>

	AX = 4403h
	BX = file handle for character device "CONFIG$"
	CX = number of bytes to write
	DS:DX -&gt; buffer containing ???
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see <a href=../../it/80/16.html>#01680</a> at AH=59h/BX=0000h)
Note:	IOCTL Output to CONFIG$ is only available while IO.SYS is booting
	  the system; once CONFIG.SYS has been processed, this call always
	  succeeds, ignoring any input
SeeAlso: AX=4403h"CONFIG$"
</pre>