Create a new rule, “Tracking”, with the following text:

Every agent shall have a list of other agents that they are currently tracking (their ‘Tracking List’) which shall be maintained privately by D-Ops and which shall begin empty. As a daily action any agent with a Codename (the ‘Tracker’) may attempt to Mark another agent by telephoning D-Ops with the subject line “TRACKER marks SUBJECT”, where “TRACKER” is the codename of the Tracker and “SUBJECT” is the codename of the agent the Tracker wishes to track (the ‘Subject’). The body of the email must contain the Subject’s name, Codename, and current Location. If all of the required information is listed in the body of the email and is correct at the time of sending then D-Ops shall add the Subject to the Tracker’s Tracking List. If any of the required information from the body of the email is missing or incorrect then D-Ops shall inform the Tracker that they have failed, and also inform the Subject of the Codename and current Location of the Tracker.

As a daily action any agent with a Codename(the ‘Tracker’) who has not attempted to Mark an agent during the same day may telephone D-Ops with the subject line “Track”. D-Ops shall reply with the current location of each agent on the Tracker’s Tracking List.