Words like down, in are not always prepositions. Compare:
I ran down the road. He's in his office.
Please sit down You can go in
In the expressions down the road and in his office, down and in are prepositions: they have objects (the road, his office).
In Please sit down and You can go in, down and in have no objects. They are not prepositions, but adverbs of place, which modify the verbs sit and go.
Small adverbs like this are usually called 'adverb particles' or 'adverbial particles'. They include in, out, up, down, on, off, through, past, away, back, across, over, under. Adverb particles often join together with verbs to make two-word verbs, sometimes with completely new meanings. Examples: break down = 'stop working'; put off = 'delay', 'postpone'; work out = 'calculate'; give up = 'stop trying'. For information about these verbs, see the next section.
Precautions while using Computer and Laptops
To Retrieve a Lost Laptop
Label your laptop. Provide your full contact information so that if the device is found, the finder will be able to reach you, your company or school quickly.Know who to call. Airports especially may have a difficult lost and found process, when it concerns the loss of a laptop computer or other data bearing devices. Know what youre up against if a laptop does go missing at an airport or your hotel.