If you bring up the Channel Guide for the LG TV, we show you the list of all of the apps installed on the LG WebOS models. If you then choose to launch one of them, you may see the command go by in the command bar showing what the application name/ID is. You would then create an .APPLICATION LAUNCH command to launch that. That's going to be usually the better bet with an LG TV.
DIAL is a bit of a wild west. Exactly what works on which TV is semi-random. However, the app names for launching are standardized and listed here so this should be another option:http://www.dial-multiscreen.org/dial-re ... e-database