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:confused:

Can you specify...? Or are you talking in general...?

You can turn on Full keyboard access for All controls in System -> Preferences -> Keyboard & Mouse -> Keyboard Shortcuts, and then navigate most things with keyboard shortcuts, the arrow keys and space/enter/return as "click" (just look at the list of shortcuts in the above mentioned prefpane).
 
Ok... when you've enabled full keyboard access, you can use tab to cycle between links (and form items) on a website, and use the enter or return key to "click" the marked/active one... :)
 
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