 use the $fopen() system task to open arbitrary files in the user's
directory for read and write.  This can be useful for debugging
circuits, but should not be enabled for untrusted circuits.

<li><b>Enable the $writememb() and $writememh() system tasks:</b> If
enabled, user circuits can use the $writememb() and $writememh()
system tasks to write the contents of a memory to an arbitrary files
in the user's directory.  This can be useful for debugging
circuits, but should not be enabled for untrusted circuit