Hello PatrickG,
Let me help you.
It is possible to set triple monitor configuration but it is necessary to follow and meet some requirements.
When having a video card and Intel® HD graphics on the same computer it is called Switchable graphics. There are some computer models that support this feature but the Computer Manufacture is the only one who can confirm if the motherboard supports switchable graphics.
If using only HD Graphics controller, you can find important information here:
http://www.intel.com/support/graphics/sb/CS-033714.htm
Kevin M