Also, I do not understand what the qq, q and backticks are in the argument of "send" in the documentation.

qq is the double-quote operator in Perl which allows interpolation of variables, such as your $data, and escape characters, such as \n.

q is the single-quote operator which prevents interpolation.

The backticks are merely delimiters for q and qq. Do not confuse them with qx. In my opinion, they are a poor choice of delimiters; I would prefer something like curlies instead: qq{}.

Update: For more help, you could try a Super Search where any text contains all of "statistics::r", "send": ?node_id=3989;BIT=statistics%3A%3Ar%20send

Also, StackOverflow has a dedicated R tag. You could try getting help there.