BTW Dave...The Celestial Globe in the screensaver has as you said, many purple dots...They are known Pulsars. There are also, hard to see, dark red spots and these are Super Nova remnants. The globe rotates continuously about a variable axis and is attractive to watch. It also tabulates various data at the four corners of the screen.
The project has been running for five years and a few days ago discovered its first Pulsar. The power of the peoples computers in use is reckoned to equate with one of the great super computers.


Sorry for the oversize on this one to get the detail...Hard to get the perspective of this without it rotating...The nearest are going from right to left and the far ones from left to right. Centreish on the far side you may recognise Orion.

Every now and then when it is busy doing something important it just says this!