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Int 21 Fn 64 U - OS/2 V2.0+ Virtual DOS Machine - Get Session Title [O]
AH = 64h
DX = 0002h (function number)
CX = 636Ch (magic value, "cl")
BX = 0000h (indicates special request)
ES:DI -> 13-byte buffer for current title
Return: buffer filled (single 00h if title never changed)
Note: if CX is not 636Ch on entry, INT 21/AH=6Ch is invoked, because a bug
in OS/2 1.x FAPI erroneously called AH=64h instead of AH=6Ch
See Also: AH=64h/BX=0000h,AH=64h/BX=0001h,INT 15/AH=12h/BH=05h
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