Basic Networking Question

I have 2 CPUs, 2 mobo, 2 PSU, 2 HDD, 2 AGP cards, 2 Mice but only one Monitor and one Keyboard. i just upgraded my system and the old stuff is just lying around. i was thinking if i cud network 2 systems but use only one Keyboard, One mouse and one monitor. The reason being, i have a TV-Tuner card and if i am recording something i better not do anythin else. Even playing MS Hearts sometimes screws up the recording. so i want to dedicate one system for recording and other for gaming. But i want to access all my files split in both the HDDs.

So help me set-up a network with One monitor, One Mouse and One Keyboard. Oh BTW, there is a set-top box available which is basically for servers (so i am told) which is what i need. it takes input from 1 keyboard, 1 mouse and 1 monitor but drives 2 systems. But that thing is darn expensive. for its cost i cud get a 15" monitor and a new keyboard. is there a easy way out?? i wudnt mind experimenting on my own and building my own "set-top box", of course with all ur help.

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