Help System (web edition)

SET L1,L2,K
copies the non-space characters of the image line K to each of the lines
L1-L2. See also PUTEND?

SET L1,L2,K,s                                    / April 2015
copies the non-space characters of the image line K to lines
L1,L1+s,L1+2*s,... until L2.