How to see whole network on a mac?
In Finder, go to the highest level available by repeatedly pressing Command-Up, or by right clicking the current folder name in the title bar and selecting the bottom entry.

From this location (called "Arnoud's Macbook Pro" or something), you should see a folder called "Network." This will show you a variety of network shares.

To see every device advertising itself on the network, check out Bonjour Browser, which will display all registered zeroconf devices.