The Laptop and the Desktop will read the "Clear Network" USB stick the same. The operating system is what decides the action to take when inserting a USB...anything. So what you are wondering about (correct me if I'm wrong) is; How to configure a Clear Network brand wireless internet onto your desktop. There is many variations as to the answers. Is it pre-paid or contract? When you insert it into your computer's USB slot, it should take a bit to load the drivers. You should see a little window pop up in the lower right that says something to that similarity. Wait until it is finished and it would say: "_______ now ready to use."
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When you insert it, it will prompt you with asking for an install disk. This would come with the USB and if you have the old packaging lying around, that'd be where I'd start searching. Modern wireless USB drives have the driver install information already on them and don't usually come with a disk. After your drivers are installed it should let you know the device is ready to use. At which point, should do it's job i.e. connect to the internet via cellular data.