INT 2F - European MS-DOS 4.0 POPUP - "SavePu" - SAVE POPUP SCREEN
	AX = 1402h
	ES:DI -> save buffer (0000h:0000h for default buffer in POPUP)
Return: CF clear if successful
	CF set on error
	    AX = error code (see #02625)
SeeAlso: AX=1400h"POPUP",AX=1401h"POPUP",AX=1403h"POPUP"


(Table 02625)
Values for POPUP error code:
 0001h	process does not own screen
 0004h	unknown error
 0005h	invalid pointer