Eclipse - Go to function

Following in the foot steps of Jon's blog on a very cool Eclipse function (Eclipse C/C++ IDE File/Folder Restore), here is another very useful function of Eclipse.

This function allows you to go to a variable, function, etc. from where you are calling it.  The variable/function that you are interested in is linked to another part of your code and Eclipse of course knows this (assuming you have completed a build).  So how do you do it?

Hold down the Ctrl button and click on the variable/function as if it were a regular link.