Guest Book

Guest Book is a simple program that keeps track of who has occupied a Net area for a fixed period of time. Whenever a runner moves within two grid squares of a guest book program, they have "signed" the book (netrunners operating under invisibility/stealth routines are not detected). A Difficult Interface roll will allow a runner to know that they have been tagged. If they want to erase their entry from the log, treat it as an a STR 3 Code Gate. Upon termination of this program, e-mail is sent to a predetermined account with a log of all the icons that have passed. This is a common surveillance tool in public-access corporate data fortresses.

Source

 * Chromebook Volume 4, pg.51