Separate address spaces mean that one process won't accidentally stomp on or read from other processes' memory, not that they can't if they choose to. A debugge

Separate address spaces mean that one process won't accidentally stomp on or read from other processes' memory, not that they can't if they choose to. A debugger is the canonical example of something that's sole purpose is to inspect and modify the state of another process. There are some permissions and restrictions around the ability to do this, but most desktop OS's won't stop a user from doing so to processes they own.