reftex: Reference Info
3.5 Reference Info
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When point is idle for more than ‘reftex-idle-time’ seconds on the
argument of a ‘\ref’ macro, the echo area will display some information
about the label referenced there. Note that the information is only
displayed if the echo area is not occupied by a different message.
RefTeX can also display the label definition corresponding to a
‘\ref’ macro, or all reference locations corresponding to a ‘\label’
macro. Viewing Cross-References, for more information.