Opens a dialog with value displayed as the message to the user.
value may be of any type, but is typically a string.
user-message (word "There are " count turtles " turtles.")
Note that if a user closes the user-message dialog with the "X" in the corner, the behavior will be the same as if they had clicked "OK".
See the User Interaction Primitives section of the Programming Guide for additional details.
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