a user is working on a home computer when another user seems to open an application to view documents on the same computer. the user immediately suspects that a back door into the computer exists.which action should be taken first to deal with the problem?

The user should immediately disconnect the computer from the internet or any other network it is connected to. The user should then scan the computer for malware and viruses and remove any that are found. The user should then change all passwords on the computer.

What is computer?
A computer is indeed a digital electrical device that may be configured to automatically perform series of logical or mathematical operations (computation). Programs are generic set of operations that can be carried out by modern computers. These apps give computers the ability to carry out a variety of tasks. A computer system is a "full" computer that comes with the peripheral devices, operating system, and hardware required for "full" functioning. This phrase may also apply to a collection of connected computers that work as a unit, such as a computer network a computer cluster. Computers are used as control systems in a wide range of industrial goods.

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