Copies the current region to the Cut buffer. The contents of the buffer may then be pasted into a window using the standard method for pasting (in UNIX this is usually achieved by clicking the middle mouse button).
Inserts the contents of the Cut buffer at the current point. You can put text from a window into the Cut buffer using the standard method for cutting text (usually by holding the left mouse button while dragging the mouse).
Note that marks may also be set by using editor key sequences--see Marks and regions--but also note that a region must be defined
by using the mouse
by using editor key sequences, as the region may become unset if a combination of the two is used. For example, using
Ctrl+Space to set a mark and then using the mouse to go to the start of the required region unsets the mark.
Invokes the Editor Command Save Region, saving the region between the current point and the mark at the top of the kill ring. If the last command was
control-shift-left-button, the Editor Command Kill Region is invoked instead. This allows one click to save the region, and two clicks to save and kill it.
LispWorks Editor User Guide (Unix version) - 17 Aug 2017