INT 16 - PC Tools v5.1+ DESKTOP API - DISPLAY ASCIZ STRING CENTERED IN WINDOW
AX = FFCCh
DS:SI -> ASCIZ string
Return: AX = ???
CX = ???
ES:DI -> address past last character displayed (v5.1/5.5)
-> ??? on menu bar (v6.0)


16FFCC - PC Tools v5.1+ DESKTOP API - DISPLAY ASCIZ STRING CENTERED IN WINDOW