Change a user's password by replacing the existing password with a combination of 6 through 15 case-sensitive letters, numbers, and special characters (only the first 8 are used, but 15 are available for users who want longer passwords, which may be easier for them to remember).
Within the first 6 characters, at least 2 must be alphabetic and at least one must be a number or special character.
Inform the user of this new password and of the need to use it when logging in to the system.