The token is a special 3 byte sequence that indicates the state of the ring; it may mark the ring as in-use, or free (anyone can use it), or health status.Any client needs to have access to the token...
The token indicates current "ownership" of the ring, in that only one client at a time can have access to the network. If you don't have the token you can't do anything on the network. It also...
"By the same token" is correct. The token gives you two for one, like buying two items with one dollar. Two ideas have a shared cause or basis. You get both "by" using the same token, not by being...