(50g) Mirror the stack

[Tugdual]

The Hp 50g supports two command sets: user RPL and system RPL.
The second has more commands and less checks making it faster than the first but also more prone to errors and possibly hard locks.
The second is also not documented in the user guide so you'll have the surf the wild wild web to get info.
You can do a lot already with user RPL, so wisely choose how you want to use your free time...