An interesting challenge

I found out that what makes computing really interesting for me are challenges: i have triffled with DOS so much recently because i challenged myself: is it possible to surf internet with pure DOS, with system that weighs (with install files) 15MiB? This challenge was finished: DOS really is suitable for internet use. It displays webpages graphically; it has several nice email clients.
Although there are not many types of clients for it (IM is almost non-existent here except IRC clients and the only ICQ client, which is broken because it uses obsolete protocol), you can always use SSHDOS or some telnet client to connect to shell server and use clients here.

I have one question which i will try to research and answer soon:
Amiga 2000 has COMM ports. COMM ports - communication ports. Is it possible to use null modem to connect to another computer and send/receive files? If so, how? What software I need? And is it possible to use them to connect external modem? If so, what max baud can it be?
This is challenge that will keep me busy for some time.