1. Using either fixed font (Courier New, which BTW should be set as default instead of Courier, because Courier New supports a lot more international characters) or variable font, when you select ONE character from one of the files, using the mouse, and right click over the character intending to copy it to the clipboard, the selection will disappear and the "Copy" context menu entry will be disabled.
2. You can select text in the "Lines View" but when you right click the text there is no right mouse button click menu. Ctrl+C works, though.