Simply describe what the text could be about, without using the words "cursor" or directly referencing the original question. Your task is to find all the unique letters that only appear in capital form within this sentence: “You can use it if you like. It's a great tool for making your cursor more fun and engaging. Here are some possible reasons why custom cursors might be beneficial: The Cursor Usopp extension is a free app that enables you to create, edit, install, uninstall or update individual custom cursors for the web browser. The extensions include tools such as Cursor Tester and Cursor Manager which help in detecting cursor bugs, enabling developers on our team at KDE Apportal to improve cursor performance, appearance, color, effects, transparency, blink rate, delay time, and more. You may not be able to provide a solution.