Int 21 Fn 64  U - Os/2 V2.1+ Virtual Dos Machine - Get Loading Message     [O]

   AH = 64h
   DX = 0008h (function number)
   CX = 636Ch (magic value, "cl")
   BX = 0000h (indicates special request)

Return: DS:DX -> '$'-terminated message "Loading.  Please wait."

Notes: 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
   this function permits National Language Support for the initial message
     displayed while WinOS2 starts a full-screen session