Both Lite as well as Professional Versions have this feature.
The current time as per your computer's time is shown continuously in digital clock.
Whenever you need the Ruling Planets you just need to click on the button 'Show RPs' and Ruling Planets are computed and displayed.
LSb: Lagna Sub-Lord
LS: Lagna Star-Lord
L: Lagna Sign-Lord
S: Moon Star-Lord
R: Moon Sign-Lord
D: Day Lord. (i.e. Sun is the day lord if it is Sunday, Moon is the day lord if it is Monday and so on. Here however the Hindu day [from sunrise to next day sunrise] is considered.)
Lastly all those ruling planets those are placed in Star or Sub of any retrograde planets are also shown so that one may exclude them.