Here are the settings for network connection. Supported connections are IPX/SPX (Local Area Network), TCP/IP (Internet), Modem to modem and Link cable (null modem cable).
You can specify IP address (ie. 123.123.123.123) or domain (ie. www.someplace.com) to search active games in those addresses. Leave blank, if you want game to search active games in LAN. Basically TCP/IP connection works just like IPX/SPX, when no address is specified.
Current modem shows which modem will be used if Modem to modem is selected. Dial number shows the number, which Capman will call when joining the game.
COM port shows the used port of the nullmodem cable.
Bugs and timelimit to change level in Deathmatch mode can also be changed here.