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[A. J. Raffles]

You know, there might be a way to put this a bit more politely... Anyway, for what it's worth, here's what the FAQ section of this page has to say about multiplayer:

[2.2.2] Can I play TTD Multiplayer?

Yes, you may play via null-modem, modem, IPX or TCP/IP network.

For IPX, you may use either Novell IPX with LSL or Windows 95 IPX
compatible protocol.

For TCP/IP, a standard Windows driver will do. However, it is rather
unstable. It must be said though, that TCP/IP games are only available
with the Windows version of the game that comes with the Tycoon
Collection.

Note that if you're using the Patch, not all options / features of the Patch work. Notably the options that require you to use the CTRL-key won't work in multi-player mode.

Mind you, I have no idea what it's all about. If it doesn't help you, I suggest that you do a bit of googling.