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Int 2F Fn 1401 - European MS-dos 4.0 Popup - "postpu" - Open/close Popup [D]
AX = 1401h
DL = function (00h open, 01h close)
DH = wait flag
00h block until screen opens
01h return error if screen is not available
02h urgent--always open screen immediately
Return: CF clear if successful
BX = amount of memory needed to save screen and keyboard info,
0000h if default save location can be used (only if DH was 02h)
CF set on error
Note: the application using the screen is frozen until the popup screen is
closed
See Also: AX=1400h"POPUP",AX=1402h"POPUP",AX=1403h"POPUP"
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