The forms on which you have to apply for indefinite leave to remain in the UK can be found on the GOV.uk website. This page will lead you through a series of questions about your immigration status and will tell you which form you need.
From Eyeos: eyeOS is an Open Source Web Desktop Environment, commonly known as Web Operating System (Web OS) or Web Office. eyeOS is Open Source Software. The basic System comes with some office and PIM applications, and the complete eyeOS software database can be found at eyeApps and in the public server.
OS stands for Operating System. A computer's operating system is the foundation software that lets everything happen on the computer. Windows, OS X, and Linux are the most common operating systems for computers. iOS is Apple's operating system for mobile devices (iPhone, iPad). The i is just Apple's standard branding emblem. iPhone, iPod, iPad, iOS.