a group of civil servants go into the "lock-up" procedure in a secure room at 4600 Silver Hill Road, Maryland, USA. In the afternoon they enter an office where their name and time of arrival are recorded.They are not allowed to leave until they are officially dismissed, no earlier than 18:00. Contact with people outside the room is heavily restricted. All computers have been disabled for outside communication. There is only one telephone, which is controlled by the lockup manager, who logs all conversations. Worksheets, notes, rough drafts, unused copies, single-strike ribbons or laser cartridges are collected when the lock-up ends. "Shredder Bins" are provided for office trash.