7.4. Activation BarsWhen a message is passed to a participant it triggers, or invokes, the receiving participant into doing something; at this point, the receiving participant is said to be active. To show that a participant is active, i.e., doing something, you can use an activation bar, as shown in Figure 7-6. Figure 7-6. Activation bars show that a participant is busy doing something for a period of timeAn activation bar can be shown on the sending and receiving ends of a message. It indicates that the sending participant is busy while it sends the message and the receiving participant is busy after the message has been received
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