As with the original game on PlayStation 3, Modern Warfare Remastered has 30 laptops to find throughout the single player campaign, referred to as Intel. Not only does collecting these earn you a trophy or two, you'll also unlock the ability to use various game altering cheats.
In Modern Warfare 2, Modern Warfare 3 and Black Ops II, they only allow the player to unlock achievements/trophies, though one of the Challenges for every mission in the latter game, allowing for unlocking of extra equipment, requires the player to acquire all three Intel items in the level.
By forcing players to slow down, take precautions, and consider each and every shot, it succeeds in being a memorable high-point of not just Modern Warfare, but the entire Call of Duty series. As a result of All Ghillied Up's success, most subsequent games in the franchise feature a stealth-focused mission.