Hi knightnet and welcome to LQ.
Generally computers these days do see each other on the network.
I think you'll need to be more descriptive about what you have tried to access any other systems, printers, or other devices already.
Are any of these computers running Linux?
Please also consider reading the
Site FAQ for some pointers on how to best formulate your questions as a possible guide to adding information which may aid others to help them provide you with better assistance.