Problem with printer and key binding

I have a server with Slack 10.2 and some diskless client stations running a clipper application over dosemu, but this app uses the F11 and Alt+F10 keys and they are not working. How do I fix this?

I also need to use a fourth printer port. Can I just add it like this:
$_printer = printer-share-name1, printer-share-name2, printer-share-name3, printer-share-name4 on dosemu.conf

and so on?

Thanks in advance

Alex