Guide to LaTeX (4th Edition) (Tools and Techniques

10.2. Portable Document Format 247
\hyperbaseurl{url pre}
sets a prefix for all external URLs specified by other commands,
so that the common part of a set of URLs need only be given
once; this is the same as the baseurl option, but can be changed
within the document;
\href{url}{text}
makes text into a link to the full URL given by url prefixed with
the current base URL; special characters like # and & can be type
in url directly;
\hyperimage{url}{image url}
inserts the image referenced by image url;
\hyperdef{category}{name}{text}
establishes text as a target (anchor) with name category.name;
\hyperref{url}{category}{name}{text}
makes text a link to url#category.name;
an alternate syntax is \hyperref[key]{text} to make text an
internal link to the location marked with \label{key};
\hypertarget{name}{text}
establishes text as an internal target (anchor) with the name
#name;
\hyperlink{name}{text}
makes text a link to the internal target #name.
The cross-referencing commands \ref{key} and \pageref{key} (Section
9.2.1) automatically create links to the corresponding \label{key}
location. As pointed out above, one can also create a manual link with
\hyperref[key]{text}.
The hyperref package also provides starred versions \ref* and
\pageref* which function as the regular ones but without creating a
link.
Adding Acrobat buttons
An electronic document is active, as indicated by the links within it for
jumping to other sections. But it is also possible to insert other types of
‘actions’, in the form of buttons which, when clicked, do something, like
flipping to the next page, opening another document, or even quitting.
The hyperref package can add such functionality for the Acrobat
viewers, by means of the command
\Acrobatmenu{action}{text}