Int 2F Fn DB01  U - Wingo.com - Set Callback Function Pointer              [U]

   AX = DB01h
   CX:DX -> new callback function

Return: AX = 0000h
   CX:DX -> end of resident code (stack ???)
Desc:  the callback function is used for WINGO <-> WINSTART communication

See Also: AX=DB00h"WINGO",AX=DB02h"WINGO",AX=DB03h"WINGO",AX=DB04h"WINGO"

See Also: AX=DB05h"WINGO",AX=DB06h"WINGO"