How do you know if a fuel hose is not connected?

Is it an electronic or mechanical

On some models you can unscrew the bolts that hold the neck at the top where it connects to the body of the vehicle and drop the neck with the tank.Check yours and see if you can.

You will have to let the tank down until you can reach the clamp. It will come down enough to reach everything. It is a tough job to do laying on your back.

In TCP/IP networks - the common type nowadays - each object that has an IP address, and is connected to the network, is known as a "host".

You should be able to see it in the properties of wireless connection.