Help System (web edition)

In FILE SHOW, a block a consecutive records can be marked by using
the alt-F4 key repeatedly. The marked block is indicated by emphasized 
numbers in the first (order) column.
A marked block is moved to another place in the data file by indicating
the new position of the first record of the block by the cursor and
pressing alt-F4. Please, note that the current observation indicated by
the cursor will be the first after the block. After the move, no block
is marked.
A marked block is deleted by the ctrl-END key.
  S = More information on FILE SHOW