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In regards to the average usb port hub and how many ports are available, this can vary. The average usb port hub can support up to four usb inputs at a time.
Buy a USB hub and connect to one of the USB ports. This splits any one USB port into 4 or 7 ports(depending on the model of hub).
If you are in need of more USB ports, you need to get a USB Hub. A USB Hub acts like a splitter - you connect it to one port, and the port itself allows you to connect several devices to it, rather than directly to the USB port on the PC.
3, 4, 5, 6 it depends on which one you buy. There is really no limit to the number of ports.
Simply plug into your network and share 4 USB ports.
One. A USB hub is plugged in via a USB port, that port only uses 1 IRQ. So all devices on the hub use the same IRQ. You could have a hub with 10 ports still using 1 IRQ.
a USB hub
A 7 port USB hub is a device that plugs into a single USB port on the computer and offers 7 additional USB ports. This would be used in the event that a user had more USB devices to plug in than are available on the computer.
The only parallel to USB adapter I've seen is one which allows you to hook up a parallel printer to a USB port on the computer. You could not use that manner to create USB ports.
hub
USB hub.
No. When you update the USB Host, it updates all the 'ports'. Actually, the physical ports are just places to plug things in. The updating actually happens with the software hardcoded into the USB Root Hub, which controls all the ports.