Can we get a protected/residing area?

[Angus]

It happened frequently to me that I accidently deleted important programs or data on the calc.
The thing is that unused and maybe forgotten variables can have unwanted effects on anything everytime. It is recommended to frequently delete unused user variables.

When I delete all CAS Variables using the memory browser doing SHIFT+ESC cas is clear. I seriously would like to be able to protect some CAS functions or so, but what is worse: I have my User Keys also deleted... That is really annoying!

The prime vs HP50 Thread made me try out the calc at office again. Results in lost user keys. Game over. Very sad, indeed.




edited for better understanding