zpp is Copyright (C) 1996 Alun Jones, auj@aber.ac.uk, and is FreeWare.

zpp is a simple utility which (on ARM 2/3 machines) protects pages below
0x8000 from user-mode write access. This has the effect of preventing some
of the more common forms of crashes of RISC OS. For example, any write
operation which hits location 8 will almost certainly freeze your machine.
After zpp -p has been run, this operation will merely generate an address
exception error in the guilty task.

For instructions on the use of zpp, just run the utility with no command
line arguments.
