A Decker is a person which has acquired a datajack and learned to directly interface with a cyberdeck to access the 3D virtual-reality of the Matrix. They are skilled at computer programming and traveling the data streams of the telecommunications grid. They use programs to search for important files, control remote computer systems, and tap phone calls. They can also use attack programs to clash with other deckers or crash IC (intrusion countermeasures).
After the Crash 2.0 there is no more need for a cyberdeck, because a comlink and a sim-module will do it perfectly, to access the augmented reality as well as the virtual-reality of the wifi-matrix. - So the users are no longer called "Deckers" but "hackers".