you'll need more than a keyboard, monitor and mouse - each workstation would need at least a 'thin client' meaning a cpu with ram and a network card.

Some people do this in conjunction with a central server - all permanent storage is on the server, but this situation is still quite rare.

More common is to give everyone low-end PC's with their own permanent storage, but have all user documents stored on a central (higher-end, backed-up) file server. The advantage of this setup is that these kinds of pc's are easy to buy, and you get the added benefit of secure centralized backup.

This is a bit late, in addition to what Grubby said, here's some more input, in case someone else wants to know.

On each floor you can set up a floor-wide wireless network, if you want to deparmentalise them, or you can set up a single network with wireless access points if all floors are part of the same org.

This will do away with complex cabling, routers switches and boosters, and the need to know where each wire goes, whatit's for and making sure they are secured away in a safe and tidy manner.

With wireless networks and laptops/notebooks your staff are neither desk bound nor specifically tied to a workstation or PC. And, visiting persons can be given guest access where appropriate.

Case Study
My home has four floors. Theres is a desktop system on the ground floor and on the fourth floor. The intermediate floors are accessed via Notebook systems.

The I use DLink Wireless N network adapters, and have the main router situated on the second floor. The Router is attached to an ADSL modem.

A shared printer is connexted to one desktop system downstairs and another was connected to a DLink wireless print server.

All computers are set up on the same workgroup and the network is secured with a WPA2 Key.

All computers are independent and one has both DAT and External Storage for backup.

This is my SOHO system, but I'v used similar setups for building computer labs for various schools in China, when I worked there.

Nowadays, I would not recomend to any SME a wired network UNLESS there was a specific need for fixed place workstations, a server room and extensive redundancy, hardline communications inhouse network security, and multi-department shared realtime communications riding on the back of something like Lotus Domino.

To counter what Tsc said:

I would recommend a wireless-only office network only if security and network speeds are unimportant to you.

If you ever need to move large files around, and if you ever communicate information that you don't want to share, don't use wireless. If you have to have wireless internet access, set it up on a different subnet and firewall it off from your wired lan.

Also, to answer hanoikiwi's question again, if you want a thin client setup where data from each workstation resides on a central file server, you'll need a wired network.