Rainmeter.ini - The file has two sections Rainmeter and Statistics. The Rainmeter section contains general settings that can be used to change how Rainmeter behaves. The Statistics section contains some things that few measures store in there. Do not modify them by hand.
Under the Rainmeter section:
If set to 1, the window is always on top of other windows. If 0, the window positioning is normal. If set to -1 the window stays back of the other windows.