It has a Windows Notification Area (formerly known as System Tray) icon. How much technical skill do I need to use Rainmeter? If you only want to download skins from the Internet and use them as-is, then the answer is 'none.' Rainmeter for PC provides a basic user interface for managing your library of skins, saving and restoring layouts, and changing basic settings such as a skin's location, transparency, and 'always on top' behavior. Every skin works differently, depending on the choices of that skin's individual author. Some skins even come bundled in large 'suites' and include their own tools for customizing their form and appearance, within or alongside Rainmeter's basic user interface. Others are more complex, like miniature applications themselves.
Some skins are very simple, single-purpose tools, like Windows desktop gadgets, or 'widgets' on an Android device. What is a 'skin'? Skin can be many things. There are thousands and thousands of skins available, crafted by a large and ever-growing community of program users.
Many skins are even functional: they can record your notes and to-do lists, launch your favorite applications, control your media player - all in a clean, unobtrusive interface that you can rearrange and customize to your liking.