\definecolor{hublue}{cmyk}{1.00, 0.60, 0.00, 0.20}
\definecolor{hured}{cmyk}{0.00, 0.90, 0.80, 0.40}
\definecolor{hugreen}{cmyk}{0.90, 0.10, 0.80, 0.40}
\definecolor{husand}{cmyk}{0.00, 0.05, 0.50, 0.20}
\definecolor{huslategreen}{cmyk}{0.00, 0.00, 0.10, 0.20}
\definecolor{huslateblue}{cmyk}{0.10, 0.00, 0.00, 0.20}
\tikzstyle{kleiner}=[font={\footnotesize}]
\tikzstyle{klein}=[font={\small}]
\tikzstyle{box}=[align=center, line width=2pt, draw=huslateblue, rounded corners, inner
sep=.2cm, shadeslate, drop shadow={opacity=.15}, shadow scale=1.05]
\tikzstyle{aktivbox}=[box, darkshadeslate]
\tikzstyle{nichtrundelinie}=[line width=2pt, draw=hublue, kleiner, color=hublue]
\tikzstyle{linie}=[nichtrundelinie, line cap=round]
\tikzstyle{pfeil}=[linie, -stealth']
\tikzstyle{doppelpfeil}=[linie, stealth'-stealth']
\tikzstyle{usb}=[line width=2pt, line cap=round, draw=black, decorate,
decoration=coil, kleiner]
\tikzstyle{rfid}=[decorate, decoration={expanding waves, angle=30, segment
length=6}, nichtrundelinie]
\tikzstyle{shadeslate}=[shade, top color=huslateblue!2, bottom color=huslateblue!10]
\tikzstyle{darkshadeslate}=[shade, top color=huslateblue!20, bottom
color=huslateblue!50]
\tikzstyle{internet}=[cloud, cloud ignores aspect, cloud puffs=15.7, minimum height=1.5cm, kleiner,
line width=2pt, draw=huslateblue, inner sep=.2cm, darkshadeslate,
drop shadow={opacity=.15}, shadow scale=1.05]

\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}
[klein]