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INT 2F - European MSDOS 4.0 POPUP - "PostPu" - OPEN/CLOSE POPUP SCREEN
        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
SeeAlso: AX=1402h"POPUP",AX=1403h"POPUP"

See Also: 2F1400
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