From Halopedia, the Halo wiki
A portable computer is a personal computer that can easily be transported from one location to another, similar to a modern day laptop computer. Humanity has multiple types of portable computers:
Benjamin Giraud watches a news broadcast of the Battle of Earth on a portable computer.
A 3D render of a portable computer used in Halo: Reach.
A data pad, one of the more common types of portable computer.
An arm-mounted portable computer used by Professor Laszlo Sorvad.
Computer showing a scan of the unconscious Master Chief after his plummet into the Kenyan jungle.