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What I want is to connect 2 computers (work and personal) primary for using a software KVM (Input Director or Synergy). Transferring files between them would be a plus.

The main issue is that the work computer is in a secured enterprise network, and my personal computer is using a 3G+ modem for Internet access. On the work computer I do not have Internet access (only local network).

I want to somehow connect them without to mess up either networks. I want my personal computer to not be seen in the work network. Is it possible?

Suggestions:
- use a simple UTP cable to connect the 2 computers with each other. Can they each be in both 2 networks without issues?
- use some kind of usb cable, if exists

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I assume your work computer is connected to its network with an ethernet cable. Do you have either a second ethernet or a wireless interface on that computer? – NReilingh Dec 30 '10 at 18:14
Yes, it is an ethernet cable. I can add an usb wireless interface (stick). – cripox Dec 31 '10 at 11:46
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If both computers have a spare Ethernet port, just connect them directly (a cross-over cable may or may not be necessary, depending on how old are the network cards), and configure IP addresses in the same subnet (separately from your existing networks). All relatively modern operating systems* can work with multiple networks.

* Including even Windows 95 and OS/2 Warp 4.

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Can I use an ad-hoc wireless network - using the build-in wifi on laptop and an added usb wifi stick on work computer? Will my laptop be invisible from work network? – cripox Dec 31 '10 at 11:47
@cripox: Depends on what you mean by "visibility" (reachable through TCP/IP, seen by NetBIOS, etc). Most of the time though, the two networks (work LAN and your mini-network) should stay completely separate unless you manually bridge them. – grawity Jan 1 '11 at 21:35
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