\setlength{\unitlength}{0.11mm} \begin{picture}(1040,668)(-460,160) \put(-360,580){\line(1,0){40}} \put(-360,480){\line(1,0){40}} \put(-360,380){\line(1,0){40}} \put(-360,640){\line(0,-1){260}} \put(280,200){\small clients} \put(-300,200){\small server} \put(60,240){\small network} \put(120,340){\line(1,0){200}} \put(-140,380){\line(1,0){260}} \put(120,420){\thicklines\line(0,-1){140}} \put(420,340){\oval(280,160)} \put(-140,480){\line(5,1){300}} \put(-140,580){\line(2,1){300}} \put(260,540){\oval(280,160)} \put(260,720){\oval(280,160)} \put(320,300){\framebox(200,80){}} \put(160,500){\framebox(200,80){}} \put(160,680){\framebox(200,80){}} \put(340,320){\small\sf SERVICE} \put(180,520){\small\sf SERVICE} \put(180,700){\small\sf SERVICE} \put(-250,530){\oval(380,460)} \put(-320,340){\framebox(180,80){}} \put(-320,440){\framebox(180,80){}} \put(-320,540){\framebox(180,80){}} \put(-380,640){\framebox(200,80){}} \put(-300,360){\small\sf CLIENT} \put(-300,460){\small\sf CLIENT} \put(-300,560){\small\sf CLIENT} \put(-360,660){\small\sf SERVER} \end{picture}