Using XML for DBus interfaces, which autogenerates adaptors that are used in the KStars and SimClock classes. The service name is 'org.kde.kstars' and the two objects thus far are /KStars and /KStars/SimClock. There are plans to make INDI calls seperate, but I intend to implement that in KDE 4.1

You can test this by launcing kstars, and then at konsole:

dbus-send --dest=org.kde.kstars --print-reply=x /KStars
org.kde.kstars.zoomOut

I have no idea why --print-reply is needed, but the call doesn't work without it. Similary for SimClock:

dbus-send --dest=org.kde.kstars --print-reply=h /KStars/SimClock
org.kde.kstars.SimClock.stop

You can also use dbus-viewer to find all the available object paths and corresponding methods.