A magic string is an input that a programmer believes will never come externally and which activates otherwise hidden functionality. A user of this program would likely provide input that gives an expected response in most situations. However, if the user does in fact innocently provide the pre-defined input, invoking the internal functionality, the program response is often quite unexpected to the user (thus appearing 'magical').
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Famous quotes containing the words magic and/or string:
“You become a reader because you saw and heard someone you admired enjoying the experience, someone led you to the world of books even before you could read, let you taste the magic of stories, took you to the library, and allowed you to stay up later at night to read in bed.”
—Jim Trelease (20th century)
“The most perfect expression of human behavior is a string quartet.”
—Jeffrey Tate (b. 1943)