Markers are like breadcrumb trails for finding your way back to important points in your code. CodeRush automatically drops markers (e.g., through template expansion, selection embedding, etc.). Use the Alt + Home key combination to manually drop markers.
If the clipboard contains code that you want to paste at a recently-dropped marker, you can jump back to the marker and paste in a single action by pressing SHIFT + ESC. To collect a recently-dropped marker, press the ESC key.
Marker settings (color, duration, etc.) can be specified within the Editor | Painting | Markers page of CodeRush Options.