Northern Ireland is the smallest of the four countries of the United Kingdom in terms of both area and population, containing 2.9% of the total population and 5.7% of the total area of the United Kingdom.
If you are using a wireless mouse with a USB connector and a PS/2 keyboard, verify that the USB mouse is plugged in a USB port on the computer and that the purple keyboard PS/2 plug is connected to the purple PS/2 port on the computer.
A 3G USB model allows you to use your computer (via USB port) to connect to the cellular network to get data. A Wi-Fi router simply refers to any router (for all intents and purposes, a device that lets you share an Internet connection) wirelessly using Wi-Fi. The Wi-Fi router must first itself be connected to the Internet.