Category: <b>DOS extenders</b>
<br>Flags: available only in protected mode<p>
<pre><b>INT 21 - Phar Lap 386/DOS-Extender VMM v3.0 - READ/WRITE LDT DESCRIPTOR</b>

	AX = 2531h
	BX = segment selector
	ECX = direction (00h read, 01h write)
	DS:EDX -&gt; 8-byte buffer for descriptor contents
Return: CF clear if successful
	CF set on error
	    EAX = error code
		81h invalid selector
		82h DPMI running, or not a code or data segment
</pre>