A method and apparatus for listing a bookmarked Web page as being accessible if it is presently accessible and for listing it as inaccessible if it is presently inaccessible is provided. A rare-earth magnet is mounted on the magnetic stirring apparatus and is driven in rotation by a pneumatic motor. The lower electrode has a nitrided surface portion and is in electrical contact with the contact region of the substrate. A notification can be provided on an urgent basis if program schedule conflicts or hardware or software problems with the user’s equipment are detected. The lock further comprises a lock arm pivotally supported by the frame and driven by the drive unit through the transmission. The capsules further comprise a therapeutic agent and a multilayer polyelectrolyte shell.