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For example, the student may send the statement page of an exercise by email to somebody else, and wait for that person to solve the question and mail back the solution.

This phenomenon should not be very frequent, at it requires a good preparation and organization. The physical presence of a teacher in the computer room is also an important dissuasion. However, WIMS alone cannot totally prevent such attempts, and in a very serious environment (for example an important exam), all communications should be cut or prohibited: email, chat, telnet, http to other sites, portable telephones, etc.