Over the course of the years, we have had several different types of hardware security keys (dongles). In many labs, the location of the dongle as well as the type is often historical knowledge. To help you locate your dongle, you can compare the images below with any dongles inserted in the computers of your lab. The oldest type of dongle is the microphar dongle, followed by a shorter type of parallel port (PRT) dongle. More recent dongles are USB dongles. The microphar and PRT dongles can be exchanged for a USB dongle upon request.