deletions | additions       diff --git a/Specifications.tex b/Specifications.tex  index b5c75db..588b90a 100644  --- a/Specifications.tex  +++ b/Specifications.tex 
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\item Allow circular touch phidget to press more than one key at a time  \item Ensure only physical touched are recognised and acted upon by the phidget  \item Ensure that no electrical inteference affects the phidget whilst in operation  \item When circular touch is being operated, ensure that no other navigation  device can be used (Joystick or Slider)  \end{itemize}  \subsection{Slider for Zoom Control}