How to know whether a person clicked a link in an email

["Caroline Tabach" <Caroline -at- radcom -dot- com>]

Our company sends various documents to people we work with from time to
time.
We have been told that there is a way of embedding a personalized link
so I can know whether John Smith accessed the link I sent him in the
email.
What we want to do is to send people a letter saying 
"Dear X, 
We have a new document with interesting information, click here to read
it"
I need to know if  John (and each person to whom the letter was sent)
clicked the link to read the document.
Does anyone know how to set this up?
 
Caroline Tabach
Marcom, RADCOM
caroline -at- radcom -dot- com
www.radcom.com <http://www.radcom.com/> 
www.protocols.com <http://www.protocols.com/> 


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