INT 15 U - DESQview v2.50+ - ???
AX = DE28h
BX = segment of ??? or 0000h for default
???
Return: ???
Note:   DESQview 2.50-2.52 are distributed as part of DESQview/X v1.0x.

See also: 15DE2A

15DE28 - DESQview v2.50+ - ???