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Most computer makers have conceived their notebooks to work with a keyboard and mouse, and they will also have a touch pad that can be used to move around the cursor on the screen. Lap top computers come in three varieties, and these are based on the size. An ultraportable laptop will generally weigh less than 1.7 kilograms, while a lightweight slim version will weigh up to 2.8 kilograms, and a medium sized laptop will weigh up to 3.5 kilograms. The idea for the laptop existed prior to the invention of the personal computer, and was first conceived during the 1970s. The very first laptop was the Osborne 1, which was released in 1981. Get the latest Notebook Test