Category: <b>applications</b>
<br>Flags: callout or callback (usually hooked rather than called), Undocumented function<p>
<pre><b>INT 16 - Microsoft QBASIC internal - MICROSOFT COOPERATION WITH TSR</b>

	AX = 55FEh
	DX = function
	    0000h initialize
		ES:BX -&gt; ??? function
		ES:CX -&gt; ??? structure
	    FFFFh shutdown/reset
Return: AX = result
	    4D4Bh only the INT 1B handler will be installed.
	    other: handlers for INT 08, INT 09, INT 16, INT 1B, and INT 1C
		  are installed
Notes:	The pointer in ES:CX seems to point at a structure defining a callback
	  function when new keyboard keys are pressed. If a TSR returns
	  AX=4D4Bh, QBASIC will stop (with IRQ's and interrupts enabled).
	these calls are also made by MS-DOS 6.0's DOSSHELL at startup, exit,
	  and before/after shelling out
	since EDIT.COM and HELP.COM merely invoke QBASIC, those two programs
	  will also cause this interface to be invoked
	K3PLUS v6.07+ supports this function, but will never invoke the
	  callback function
SeeAlso: AX=5500h,AX=AF4Dh,INT 1A/AX=3601h
</pre>