The naming convention for messages is as follows:
message(arguments)
The names for messages can be event or operation names. They can include actual parameters in parentheses, which would be expressions in the scope of the sender/caller. Message names are resizable, movable text frames. Text wraps to match the contour of the bounding box.
If you modify the name of an operation that exists in the model, the message is automatically realized to that operation, and IBM® Rational® Rhapsody® changes its type to the type of that operation (constructor, event, and so on).
If you change the message name to a message that does not belong to the classifier, it becomes unspecified (in analysis mode).