INT 15 - TopView - SEND MESSAGE - "SUBFROM" - WRITE ATTRIBUTES TO WINDOW
AH = 12h
BH = 0Bh
BL = window to write attributes to
00h handle is DWORD on top of stack
01h current task's default window
0Ch (DV 2.26+) default window of task owning handle on top of stack
0Dh (DV 2.26+) default window of parent of current task
STACK:  DWORD number of attributes to write
DWORD address of attributes
Note:   the attributes are written starting at the current cursor position; the
cursor is left just after the last position written

See also: 1512

1512 - TopView - SEND MESSAGE - "SUBFROM" - WRITE ATTRIBUTES TO WINDOW