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.
1 Oculus means eye. In some countries, such as the United Kingdom RE (right eye), LE (left eye), and BE (both eyes) are used. Sometimes, just right and left are used.  OS is an abbreviation for oculus sinister, Latin for left eye from the patient's point of view.