Category: <b>DOS extenders</b>
<br>Flags: available only in protected mode, partially documented function<p>
<pre><b>INT 21 - Phar Lap 386/DOS-Extender v6.0+ - ALLOCATE LDT DESCRIPTOR</b>

	AX = 253Fh
	BX = LDT descriptor to allocate (0000h for any)
	???
Return: ???
</pre>