'unlockall things on the code entry on the career mode
Depends on what hub you have, and how you want to do the change. If your current hub has a multi-speed freewheel you will need a freewheel puller. If your current hub is a freehub you will need a chain whip and a lockring tool. If your current hub is an IGH, all you need to do is to unhook your shifter cable.
Get a high speed hub.
The speed sensor may be built into the hub bearing. In that case the whole hub bearing needs to be replaced.
No a hub will not speed up your connection, your connection is based on the ISP. A hub sends the information to every computer on the network until it finds the computer that sent the request.
The Generic USB Hub is a HI-SPEED USB device and will function at reduced speed when plugged into a non-HI-SPEED port
Rotor hub links the blades to the low-speed shaft
No, replace the entire hub.
First find out what type of hub you have, it'll be printed on the hub somewhere. Then just do a net search for "shifter" + hub name and 3 speed.
First you need to decide how much you need the high speed hub. If it's one of those "I gotta have it" things, you'll need to add some hardware. Your Dell is a laptop so you'll need to add a PCMCIA USB 2.0 card, but if someone were updating a desktop he/she would use a PCI card. See the related links on this page for more information.
in the hub
You need to replace the rear wheel hub - bearing and speed sensor inclusive
A Hub's speed is determined by it's type. Are you speaking of a networking hub (also called a bridge)? Or do you mean a USB Hub? Or a Firewire hub? All of these have different speeds. Most commonly would probably be a network hub, which is commonly limited to 10/100 mb Ethernet speeds. A USB Hub, if 2.0 is limited to 480mb/s over all it's ports. Hope that helps!