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+\setlength{\unitlength}{0.11mm}
+\begin{picture}(1080,488)(-500,340)
+\put(-320,500){\line(1,0){40}}
+\put(-260,600){\small\sf CLIENT}
+\put(280,600){\small\sf SERVICE}
+\put(-380,700){\small\sf SERVER}
+\put(-280,560){\framebox(180,100){}}
+\put(-400,680){\framebox(200,80){}}
+\put(260,580){\framebox(200,80){}}
+\put(-250,620){\oval(420,360)}
+\put(390,570){\oval(340,260)}
+\put(-100,600){\thicklines\vector(1,0){360}}
+\put(260,640){\thicklines\vector(-1,0){360}}
+\put(20,660){\small requests}
+\put(-20,560){\small events, errors}
+\put(-320,680){\line(0,-1){220}}
+\put(-320,620){\line(1,0){40}}
+\put(320,500){\small\sf EVQUEUE}
+\put(300,480){\framebox(220,60){}}
+\put(320,580){\thicklines\vector(0,-1){40}}
+\put(-320,380){\small server}
+\put(340,380){\small client}
+\end{picture}