Dazzler

Dazzler is anti-personnel/systemware is much more than jut a program: it's an entire VR, albeit a small one. The program attacks, and if it succeeds, it subverts the circuitry of the Netrunner's deck, feeding it VR data generated by the program. This means that the Netrunner proceeds to run against an artificially generated system, while his true Netspace position remains constant This makes it very easy for Dazzler's integral tracer to track the Netrunner's meat position, which it will do automatically in three Net turns. If the Netrunner figures out what is going on before then and uses Gatemaster or something similar to purge the program feed from his system, he will not be traced. Alternatively, if he jacks out for some other reason, he will not be traced. Dazzler is programmed uniquely for every system, since the virtual location must look like the part of the system that the Netrunner is currently in.

Source

 * Chromebook Volume 3, pg.75