How many times per minute do you think it would be safe for a user to send this data to the server? So they can have the most up to date information possible.

I am trying to avoid locking a file based on the user that is viewing it, because I want everyone to be able to view it at the same time, and I want to know that if I have 100 users sending and receiving this much data how often they can check and receive data without crippling the server?

This is how I am refreshing data:

   computer sends fileID# and updateCounter#
   |
   |
   server get fileID# and updateCounter#
   server checks against DB for changes to file by comparing
   updateCounter#
   (could also be timestamp) results in 2 scenarios

   _scenario1_
   if change is made to file server sends back file data and a command to
   use that data to refresh the UI.

   _scenario2_
   if no change has been made
   no data is passed back

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