I had a program under OS 9 that could be used to do this (mostly
to cheat at games :)
That programs usually didn't dare to just write and used
undocumented APIs from PrivateInterfaceLib instead.
Why would you need to do that?
Most modern operating systems do not allow one application to
access memory of another application (apart from shared memory
which requires the processes to cooperate).
Well, most modern OSes allow you to do it through the VM APIs and
you can map a portion of one process's virtual address space into
your own process's address space where you can change it and
possibly write it back if you have the enough privileges to do so,
of course.
Someone already wrote a version of The Cheat to Mac OS X. You can
probably use it as reference. It's available with source at <http://
www.brokenzipper.com/> (GPL licenced).
--
Pelle Johansson
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