David,
Our own Al Sheehan developed this neat little program which provides a moveable screen reticle. This can be placed over the PHD screen to allow the target star to be accurately positioned on the "virtual slit" - an excellent aid for us in spectroscopy.
http://www.iceinspace.com.au/forum/s...ad.php?t=21798
The latest version is V2.2 and is also the Y! group files area.