Category: <b>DOS kernel</b>
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<pre><b>INT 2F - European MS-DOS 4.0 POPUP - "CheckPu" - INSTALLATION CHECK</b>

	AX = 1400h
Return: AX = FFFFh if installed
	    BX = maximum memory required to save screen and keyboard info
	CF clear if successful
	CF set on error
	    AX = error code
		0002h invalid function
		0004h unknown error
Note:	the POPUP interface is used by background programs (see INT 21/AH=80h)
	  to communicate with the user
SeeAlso: AX=1401h"POPUP",AX=1402h"POPUP",AX=1403h"POPUP"
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