The modern PC is a marvel of technology. One of its more useful capabilities is the ability to use the CD-ROM or DVD-ROM drive as a boot disk. Many Linux distros use this feature to launch their installers, but if you can boot off the CD, why can't you run off the CD? In fact, you can. The cool thing about all this is that you don't have to install anything on your computer. In our other articles this week, we've looked at distros that had to be installed to your hard disk before you could use them. But that's...