/disk 192.168.1.0/24(rw)
This exports the /disk directory to the whole 192.168.1.0/24 class C network. Any machine on that network may then mount the filesystem and both read and write to it. You could also pick to export to just one machine if you wanted to with a line like this:
/disk 192.168.1.1(rw)
You can also export to machines by name.