% Copyright (c) 1988 Massachusetts Institute of Technology
%	$Source: /mit/zephyr/repository/zephyr/doc/progman/interaction-pic.tex,v $
%	$Author: jtkohl $
%	$Header: /mit/zephyr/repository/zephyr/doc/progman/interaction-pic.tex,v 2.0 1989/04/05 15:52:42 jtkohl Exp $
%
\setlength{\unitlength}{.1in}
% This is a hostmanager - coords are center point
\def\zhostmanager(#1,#2){
	\thinlines
	\put(#1,#2){\oval(10,5)}
	\put(#1,#2){\makebox(0,0){\small HostManager}}
}
% This is a client - coords are bottom left
\def\zclient(#1,#2){
	\thinlines
	\put(#1,#2){\framebox(10,4){\small Client}}
}
% This is a client with a dashed box - coords are bottom left
\def\zdashedclient(#1,#2){
	\thinlines
	\put(#1,#2){\dashbox{.5}(10,4){\small Client}}
}
\begin{center}
\begin{picture}(50,40)
% Draw big server at top
\thicklines
\put(15,32.5){\framebox(20,7){\large Server}}
\put(15.5,33){\framebox(19,6){}}
\put(16,33.5){\framebox(18,5){}}
% Draw hostmanager on left
\zhostmanager(15,20)
% Client under it
\zclient(10,8)
% A dashed client under that one
\zdashedclient(10,2)
% Draw hostmanager on right
\zhostmanager(35,20)
% Clients under it
\zclient(30,8)
\zdashedclient(30,2)
% Connect hostmanager on right to server
\put(37,22.5){\vector(-1,4){2.5}}
\put(37,24){\tiny notice}
\put(30.5,32.5){\vector(1,-4){2.5}}
\put(26,31){\tiny SERVACK}
% Connect client on right to hostmanager
\put(37,12){\vector(0,1){5.5}}
\put(37.5,13){\tiny notice}
\put(33,17.5){\vector(0,-1){5.5}}
\put(28,14){\shortstack{\tiny HMACK \\ \tiny \& \\ \tiny SERVACK}}
% Connect server to client on left
\put(24,32.5){\line(0,-1){23}}
\put(24,9.5){\vector(-1,0){4}}
\put(24.5,29){\tiny notice}
\put(20,11){\line(1,0){2}}
\put(22,11){\vector(0,1){21.5}}
\put(16,13){\tiny CLIENTACK}
% Label the hosts
\put(15,0){\makebox(0,0){Receiving Host}}
\put(35,0){\makebox(0,0){Sending Host}}
\end{picture}
\end{center}