Charles has provided a couple of excellent links which answer your specific questions along with providing a heap more information. Let us know if you get lost and can't find the wood amongst the trees.

Get everything else working before you go playing with those button icons. Focus on usability and making it easy to use. Usability is not just from the physio's point of view - it needs to include how the patient gets and uses the output as well as how you go about adding or changing exercises in the template and rolling that out to the physios.

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Andrew Lockton
Chrysalis Design, Melbourne Australia