Moving in Realtime with a slider

Carrying on from a previous thread (http://blenderartists.org/forum/showthread.php?t=88430) I was wondering whether it was possible to have something continously moving when you moved a slider? E.g. A slider is controlling the locx, and if you wanted to move it from 1 to 8 have the object move with the slider rather than it just reappear at 8. Crouch mentioned that the slider has a realtime parameter, but I can’t seem to get it to work.
Any help or points in the right direction would be most appreciated!