Anti-virus programs protect a computer system from viruses by examining the computer's memory and file system for signs of virus infestation. This examination process is called scanning. Anti-virus programmers use two main scanning strategies - on demand and on access scanning. In on-demand scanning, users voluntarily activate a virus-scanning program each time they want to examine the computer for viruses. In on-access virus scanning, the virus scanner that continually examines the computers memory and file system automatically activates each time one of these resources is accessed by a program.
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