What is this message "_parameter_*" about Max for live UI objects

leico's icon

When I digged/reverse engineered Map8 patch, in Max for Live Essentials pack,
to bandit/learn about Max for Live technique, I found a unknown message about
"_parameter_shortname"(attatched image).

It effects live.dial's shortname, but I can't find on reference / Help / Attributes / Messages.
I tried to "_parameter_range" message, it effects live.dial's range I guess, and It works I surprised.

Does anyone know about it?
Future functions or Lost functions ? Deprecated ?

Max Patch
Copy patch and select New From Clipboard in Max.

Here is test patch.