It sends the file "args.1" to the ImageWriter II (directly
connected to A/UX tty1) without any problem:
troff -man -Tiw args.1 | daiw | lp
The key point is that you must specify the "-Tiw" option in the "troff"
command, so that the output of "troff" can be recognized by the "daiw"
command. This assumes that ImageWriter II is the default system printer.