I was looking for something like this:
https://sites.google.com/site/testappscript2/
At the moment, I do not think that you will see anything if you are not logged in to Google, but if you are then it can show this:
Welcome, I don’t know your name, but if you add your data here: https://docs.google.com/spreadsheet/ccc?key=0Aq72y9iq5_1UdG5LR0tCVTRXOVQtbkNLR1Q3eE5MR0E#gid=0 I could tell you the following task
if your Google email is in a spreadsheet, it will show a personalized message.
My idea is to control what the student sees on Google’s website for the course, depending on how the instructor updated the student’s data in the spreadsheet online so that the student can see what tasks they completed, what they need to do next and, possibly, even their grades ...
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