Storing information in platform specifications
We often allow people to require certain qualities of the machine their answer is run on, (for example Operating System). However we should disallow requiring the program to be run on a certain specification to store information used for the challenge.
For example the language Nullary only has zero length programs instead deriving its source from the time since epoch. Similar languages could be created to exploit things such as monitor/terminal size, screen brightness, volume or even Operating System.
These types of answers should be disallowed.