To go online you need a dial up internet service, the necessary phone cable and a DreamKey disc which lets you use your own ISP (sega's servers ceased quite some time ago now). To get a DreamKey disc for free you need to ask Sega Europe for one. See:
http://sega-en.custhelp.com/cgi-bin/...cGFnZT0x&p_li=
You can connect 2 DCs together but you need the serial cable (to go in that serial port you mentioned). That said there's very few games that offer link up play - the only ones I can think of are F355 Challenge (the option is hidden on the PAL version I have) and Virtua On - OT (Japanese game).
The windows CE compatibility means games developed for the win CE environment will work easliy/port easily with the DC. I think it allowed developers greater ease when porting PC games.
As for FPS, the DC lacked many good story driven single player games (especially with Half-Life not being finished) but had a few deathmatch type games. The better ones in my opinion are Quake III & Outtrigger. Also of note are Soldier of Fortune (suffers from long loading times) and Unreal Tournament (suffers from slowdown/dodgy framerates in splitscreen mode). If you like slow sqaud based tactical shooters, you may like Hidden & Dangerous. The NxMakaqu version of Quake 1 is also very good - better visually than RadQuake.
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