Jmol is a new system for viewing protein structures from within a WEB browser (though it also runs stand-alone). Jmol requires a newer generation browser, with JAVA and JavaScript enabled. On Macintosh computers, this requires Safari (at the moment, ONLY Safari will work - not Netscape or Internet Explorer). In Windows computers, a variety of browsers are supported, mostly.
At the moment, in the CRC, Jmol runs best on the Macintosh computers running the Safari WEB browser. Try it out on a sample protein.. On Windows at home, the browser FireFox works best. Install that and then go to the sample protein site above. For (temporary?) technical reasons, Jmol doesn't work well on the Windows computers in the CRC (though you can get some functionality in Internet Explorer). Again, try it and see.