yep alcohol 120 is a v usefull tool,
you download a image of a cd/dvd and rather than using a disc to burn it, you can use alcohol to 'mount' the image as a virtual drive - so in 'My computer' it appears as another CD or DVD drive and works just the same.
ive got 3 vitual mapped drives with it - (you can have as many as you want)
you use the image finder tool , then right click and ' mount image'
you wonder how you ever did without it once you get the hang of it
eddited to add - you dont actually burn them to a folder - it actually reads the files on teh fly - once an image is mounted (literally 2 seconds) it stays as a drive letter until you click 'eject'