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There are four different cross reference commands:
@xrefUsed to start a sentence in the printed manual saying ‘See …’ or an Info cross-reference saying ‘*Note name: node.’.
@refUsed within or, more often, at the end of a sentence; same as
@xref for Info; produces just the reference in the printed
manual without a preceding ‘See’.
@pxrefUsed within parentheses to make a reference that suits both an Info file and a printed book. Starts with a lower case ‘see’ within the printed manual. (‘p’ is for ‘parenthesis’.)
@inforefUsed to make a reference to an Info file for which there is no printed manual.
(The @cite command is used to make references to books and
manuals for which there is no corresponding Info file and, therefore,
no node to which to point. See @cite.)