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This impressive add-on will let you control the telescope and many features inside the dome. What can you do? View the dome and telescope from any angle, open and close the dome, turn the adaptive-optics laser on and off, open and close the telescope's mirror cover, raise and lower the dome crane, move the Coudé flat into and out of place, and a whole lot more!
Selden has more features planned for a future version, but in the meantime, if you don't already have it, download Celestia (Celestia v1.5.0, prerelease 4 or later) and then visit Selden's page to get your own Hale Telescope.
Have fun!