When you are designing a distributed/concurrent system in UML, you'll
have to 
know where the different paths of execution will start.

The following sections is snippped from "The Unified Modeling Language
User Guide" 
by Grady, Rumbaugh & Jacobsen (page 311)

"An active object is an object what owns a process or thread and can
initiate 
control activity. An active class is a class whose instances are active
objects."

-- snipped some talk about processes and threads--

"Graphically, an active class is rendered as a rectangle with thick
lines."

Torben

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