deletions | additions       diff --git a/Specifications.tex b/Specifications.tex  index 452257b..10cb26b 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 device can be used  \end{itemize}  \subsection{Slider for Zoom Control}  \begin{itemize}  \item Slider must be able to control zoom in and zoom out when a certain threshhold is reached  \item When slider is inactive, ensure other devices can be used  \item When slider is active, ensure no other devices can be used  \end{itemize}  \subsection{Phidget Screen for Feedback}