Space.c = (0,0); % The origin

horizontally(200, client, Mirror, PPGUI);
horizontally(200, ints, Master, Space, PPActions);
horizontally(200, server, MasterImpl, PPActionsImpl);

pair row;
row = (0,-100);

client.c + 2*row = ints.c + row = server.c;


cline = 30;

color clcolor, scolor;
scolor = (.7,.8,1);
clcolor = (1,.7,.7);

cleft = xpart Master.c - 50;
cright = xpart PPActions.c + 50;

draw (cleft, cline) -- (cright, cline) withpen 
    pencircle scaled 10pt withcolor clcolor;

draw (cleft, -cline) -- (cright, -cline) withpen 
    pencircle scaled 10pt withcolor scolor;

begingroup;
save defaultscale;
defaultscale = 5;
draw thelabel.top("client", (cleft, cline)) withcolor clcolor;
draw thelabel.bot("server", (cleft, -cline)) withcolor scolor;
endgroup;