F2:  This key copies all characters up to (but not including) a specified
character from the retained line to the current line.  For example, suppose
DISKCOPY A: B: is the retained line.  If you press F2 and then press P, all
characters up to the P will be copied.  DISKCO will be the current line.

On the PCjr:  Hold down FN and press 2.
