A canned response is basically a cookie cutter response to repetitive emails.
It could be a simple "Thank you for your email, we will get back to you shortly"
Or a long form letter to the parent where you can manually enter the names afterwards:
Hi Mr or Ms. ,
Your Child has been tardy....
First turn on the canned response feature in Gmail labs:
Now create and save your canned response for future use:
Finally insert your newly created Canned Response into a blank email:
If you have any Questions or Suggestions, follow this link here: http://goo.gl/2mTkUU