Yah, that's my weak spot. When I get home and have the book in hand I'll post a rundown of decking. In the meanwhile:
Matrix - Wireless: At the time of Crash 2.0, one corp was releasing wireless tech able to handle matrix-grade bandwidth. The Crash inspired corps to roll out wireless as a way to rebuild faster. With the uber virus causing hardware to physically catch fire (Cooling Fans? We don't need no stinkin' cooling fans!), server rooms became dangerous places. Much safer to scatter networking gear hither and yon using multiple power circuits. The second advantage was ubiquitous data accessibility on-site that upped productivity since you can access data wherever the signal reaches and good design can ensure the signal doesn't punch through the walls.
With the advent of wireless gear came Personal Area Networks (PANs - a term familiar to people with Bluetooth phones) consisting of a Comm and your other gear. A Comm is Pocket Sec 2.0. Go look at a Treo 650 and add ten generations until you get something like an
EFC Global. It is a handheld computer with a transceiver that can coordinate multiple devices. Comms coordinate your HUD-enabled glasses, subvocal mike, earbuds, drones, and smartguns.
Comms have various properties such as signal strength, firewall, and OS. Storage is considered such a non-issue in 2070 that the megapulse (Mp) has faded from use. The firewall provides protection from outside hackers, the OS has various performance qualities, and signal strength says how far away you can be from another transmitter.
Technomancers: Otaku have been renamed "Technomancers." They still wander the net without need of hardware and use "Complex Form" sprites to handle their tasks. IIRC there is a limitation of Logic x3 complex forms at char-gen but I'm not sure if there's a limit for active characters.
Technomancers are their own Comm and do not need any cyber in the slightest. According to the SR developer who wrote the Hacking rules, he expects rules on hacking a Technomancer's brain to show up at some point. Imagine the potential fun and games that could cause.