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Initialize a toplevel
- one of the atoms 'tty' or 'gui'
Initializes streams and event handlers in preparation to
a call to toplevel/0. Two variants of toplevel loop can be
selected: command line oriented (tty) or server oriented
(gui). The latter is intended for an ECLiPSe which is
embedded or remote-interfaced to a GUI-based host program.
toplevel / 0, break / 0