Adobe Acrobat Reader (freeware):  http://www.adobe.com/products/acrobat/readstep2.html
	IrfanView (a freeware graphics viewer for IBM):  http://softwarecenter.net/irfanview/main3.html
	WinZip (a shareware zip and unzip program for IBM):  http://www.winzip.com/ddchomea.htm
	Aladdin Stuffit Expander (a shareware unzip program for Mac):  http://www.aladdinsys.com/expander/expander_mac_login.html