The present invention generally relates to a system and method for selectively blocking computer application access and, specifically, to a system and method for blocking Internet access and/or applications when a specified string of characters is entered from a keyboard or other input device. Specifically in one embodiment is provided a system for selectively blocking computer application access of a selected user, which includes a blocking program configured to monitor keystrokes of said user, a predefined database of keystrokes, the program continuously monitoring said user keystrokes and comparing them to said database of keystrokes, and a predefined action when said user keystrokes match said database keystrokes. The predefined action can be to block Internet access or terminate an Internet connection, or Internet protocol, or computer application.