Using the Dock Understanding the Basics 3. Attach the security post to the tray (optional). The security post blocks access to the OmniBook CardBus/PCMCIA cards. The security post on your tray may be in a different location from that shown below. 4. Insert the tabs on the back of the tray into the slots in the dock and press down on the front edge of the tray to lock it in place. 5. Connect your external devices to the dock. See “ Making Connections” on page 1-24. 1-13