The "restore code," which is the (normally integer) value passed as the second argument to restoreGame(). The restore code gives us some idea of what triggered the restoration. By default, we define the following restore codes:

1 - the system is restoring a game as part of interpreter startup, usually because the user explicitly specified a game to restore on the interpreter command line or via a GUI shell mechanism, such as double-clicking on a saved game file from the desktop.

2 - the user is explicitly restoring a game via a RESTORE command.

Games and library extensions can use their own additional restore codes in their calls to restoreGame().