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.tex files from help.loncapa.org largely done. Added some lables to
older files. Last mega-massive .tex commit for a while.

\label{Ambiguous_Reference}
This error message has come up when a user tried to look at a resource
in the publication space, while the viewer is not currently in a
class.

LON-CAPA's resources are rendered very dynamically, reacting to the
class the viewer is in, where in a sequence they are, whether they've
finished other problems correctly, how many times they've tried a
problem... all of these things are stored as part of the information a
course keeps track of about a student. When viewing resources that
depend on this information to determine how to render them correctly
while not actually in a course, LON-CAPA cannot really determine how
to correctly render the resource. 

Rather then simply refuse to show you the resource, LON-CAPA will try
to make reasonable guesses about how you want to view the resource. In
order to warn you that this is not a definitive rendering of the
resource, LON-CAPA displays the warning ``Could not handle ambiguous
resource reference'' to warn you that it's guessing about the
resource.

For the same reasons as LON-CAPA cannot ``correctly'' determine how to
render the resource, you will not be able to correctly interact with a
resource viewed with an ambiguous reference. LON-CAPA logs a student's
interaction with a resource in the course information, so if you are
not viewing the resource from inside a course, LON-CAPA has nowhere to
store information about whether or not you've gotten the problem
correct, how many tried you should be allowed, etc, so all input to
the problem will simply be discarded. To test the problem, use your
\textbf{Construction Space}.