What is the difference between the activity file (.pka) that I author and the activity file that I give to others?
The activity file created with Activity Wizard contains both the authoring information and the activity itself. If you do not want others to view or change the contents of your activity, you may password protect the activity in Activity Wizard. Just like a regular Packet Tracer 4.11 network file (.pkt), the progress of activity files can be saved at any time. To have a fresh activity for redistribution, be sure to reset the activity in the instructions box, then save the activity.