Accompanying Frotz is FrotzStdIO, a version of Frotz which uses only
standard input and output (i.e. a shell window). This allows Frotz to take
input from a file, or to be used over a network. In the latter case, the
output terminal must support ANSI 3.64 character sequences.

FrotzStdIO can only be run from the shell, and its operation controlled only
by command line switches. In addition to the switches available in Frotz,
the following extra switches are available:

	-f	Sets the foreground pen to be used for all text. The
		default is 1 (which is usually what the shell uses, and
		is usually black).

	-w	Sets the screen width in characters. FrotzStdIO cannot
		determine the screen dimensions for any given output
		(Indeed, if the output stream is a file, there is no
		concept of a screen.), so this and the following switch
		must be used to obtain the required display size. The
		default is 77.

	-h	Sets the screen height in characters. The default is 21.

	-C	Normally CTRL-C will exit FrotzStdIO. If this switch is
		used, the CTRL-C signal is ignored.

	-T	This switch limits the length of time for a game session.
		If specified it must be followed by the maximum number of
		minutes the session may last. Warnings are issued at 5
		minutes and 1 minute before the time limit expires.

	-V	This switch can be used to limit the input and output
		capabilities of FrotzStdIO. Whatever text follows the
		switch will be used for saving and restoring games, e.g.

			-Vusername.save

		and all other file operations will be disabled. If the
		filename contains a question mark, e.g.

			-Vuser?.save

		then up to 10 save files may be used. When the game is
		saved or restored, the user is prompted for a number
		which replaces the question mark to give the saved game
		name.
   

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