Can I add a second monitor to my MacBook Air notebook and use both monitors simultaneously?

Can I add a second monitor to my MacBook Air notebook and use both monitors simultaneously?  For example, have a spreadsheet open on the notebook monitor while the second monitor is displaying an architectural drawing?

MiniDisplay-to-? adapters ... ? replaced by VGA or DVI or HDMI
Best to use only 1 adapter to match the intended cable since mutliple-adapter setup (buy a VGA, then add VGA-DVI adapter) tendsto lose signal strength.
Also graphics chips run hotter driving external display, and since the graphics chip in Air is part of the CPU the CPU may throttle itself as the integrated graphics chip heats up.
Two modes of operation:
Mirror ... same image both displays
Extended ... the other screen is "extra screen space"

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