I have an LP-3500 logic probe. In addition to the normal connectors to power and ground at the bottom, it comes with two external terminals (one red, one black), which can be connected on the side near the tip:
The connector is just connected directly to the main probe, but some of the attachments are easier for certain things than others. There is one which is an alligator clip, and the other one is a hook probe. If you press the bottom of the hook clip, you should see a small metal hook slide out of the top. You can put a lead or wire through it, then release the bottom, and the hook will retract, clamping the lead or wire under it.