The following are links to some programs available for downloading (free...) that you may find useful in expanding your on-line learning horizons.  

Program Name/ Company What the thing does URL to download page
Acrobat Reader/
Adobe
This program allows you to read files in the "portable download format" (.pdf).  This program has no editing capability. 
QuickTime/
Apple
Allows you to view QuickTime videos over your computer.  Medscape often has QuickTime videos.  
FlashPlayer/
Macromedia
Another video format.  You will need this for Dr. Karius' directed studies.
RealPlayer/
Real
Although there are no RealAudio files supported on the UHS web server, other web sites may use them.  

http://www.real.com/player/index.html
(scroll down a little to see the basic (free) player download).  

If you do NOT have PowerPoint on your computer, Microsoft offers a Powerpoint Presenter ("viewer") that will enable you to view the PowerPoint files that are on the internet. 
PowerPoint Presenter/ Microsoft
To view PowerPoint 2000 presentations
http://office.microsoft.com/downloads/2000/Ppview97.aspx