These commands control the clipping system. A clip is a snippet of
text separate from any document, which you can save to a file or insert
into a document. You can select text in a document and copy it to a
clip, optionally deleting it from your text. You can also load text
directly from a file into a clip. ne can have any number of
clips, which are distinguished by an integer. Most clip commands act on
the current clip, which can be selected with ClipNumber. Clips can
be copied and pasted in two ways—normally (as lines of text) or
vertically (as a rectangular block of characters).
Note that by using the Through command you can automatically pass a
(possibly vertical) block of text through any filter (such as sort under
UN*X).