I have a list (A) which contains these fields: Software, Quantity, Used, and Available. Fields Used and Available are hidden fields. Then I have another list (B) which contains a lookup field (Software) from list (A). I created a COUNT lookup field in list(A) to count the total of software used in list (B). What I want to accomplish is to create an event receiver to do the calculation and update fields Used and Available. How can I achieve this?

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