Blocks of text called regions can be selected and manipulated using a pair of control sequences. Move the cursor to the place in the document where you want the block to begin, then issue the first control sequence <ctrl-@>. Move the cursor to the point where you wish the block to end, then give the command <ctrl-w>. The block you have selected will disappear and will be held in what is called a killbuffer. To copy a block held in the killbuffer to another location, issue the <ctrl-y> command ('y' stands for ''yank'' back) to retrieve the text at the cursor location. The text remains in the killbuffer until another region is selected so multiple copies can be made.