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		 ATC With Plans

Delayed commands may be specified using the "@" command:

	@<location>,<command>[,<command> ...]

The comma is required after the location and between commands.

The command is any normal legal airplane control command.

A location may be any of the unique identified points on the screen:
entries, airports, or navaids.  Note that the navaids now have different
identifiers.  The navaid command still uses a '*' or ':'.

Example:  @3,AA2

A location may be further specified by giving the number of miles in
each direction from a known fix, e.g.

	    @#sw3s2,ARE

which means at the point which can be reached by going three
miles SW from fix #, then two miles S, plane A should begin
a right turn until heading E.

When the plane specified in the command reaches the location, the
command is executed automatically.

The information command shows all delayed commands pending for that plane.

Stored commands for plane A (for example) may be expunged with

	<23> A?



Fine points:

	A plane can be given commands to take effect when it
	comes onto the screen; it need not be active to get the first
	commands for its delayed list.

	To issue a navaid command for a later navaid, give a delayed
	command to take effect at the NEXT navaid.  Since navaids are
	now identified differently, it will recognize the point and
	issue the navaid command when it arrives at the first one.



Movie mode:

	The flag -p=filename will save the keystroke file and timing
	information for a game in the specified file.  There is enough
	information to re-create the game ASSUMING you use the same
	version of ATC.

	To re-play the game in movie mode, use

		atc -m=filename

	The game will use the same seed as before, and the traffic
	pattern will be identical.  At any point the observer can
	interject commands.  Probably the only useful command will
	be to request information, since the remembered commands will
	still be inserted at the remembered time.



Flow control:

	When a game is started, ATC looks for the file <airspace>.flow
	in the directory /usr/rand/jim/atc to establish a traffic pattern.
        For example, if the airspace is Apple3, it uses the file
	/usr/rand/jim/atc/Apple3.flow .

	The flow file contains one line for each legal path through the
	airspace.  Each line is left-adjusted, and consists of an origin,
	the symbol "->" (for "goes to"), the destination, a space, and
	the relative frequency of this path.  The expected frequency for
	this path is its relative frequency divided by the sum of the
	relative frequencies for all the paths.  Some examples are:

		1->5 5
		1->8 10

		2-># 10
		2->% 5
		2->6 5

		%->% 5
		#->% 10

	Blank lines are ignored (for spacing).

	Any path with no relative frequency is assumed to have frequency 0.


Things to come:

	(1) There will be a capability for canned procedures.

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