Category: <b>DOS extenders</b>
<br>Flags: available only in protected mode<p>
<pre><b>INT 31 - DPMI 0.9+ - FREE REAL MODE CALLBACK ADDRESS</b>

	AX = 0304h
	CX:DX = real mode callback address
Return: CF clear if successful
	CF set on error
	    AX = error code (DPMI 1.0+) (8024h) (see <a href=../../it/43/31.html>#03143</a>)
Note:	the limited DPMI host built into Phar Lap's 286|DOS-Extender v2.5 does
	  not support this function
SeeAlso: AX=0303h
</pre>