A lot of web sites and instruction programs encode answers to quizzes encoded in ROT or Rotate which rotates the characters in the set by a certain set of positions, 5,13, 18 etc. 5 is for numbers, 13 is just letter, and 18 does both letters and numbers.
If you are using ROT-13.com or ROT18.com as a conversion utility and want to send links with the text pre set in the conversion box use '?answer=' with your text back to the site.
Question:
"What color is a Zebra"
The answer in rot18 is:
Oynpx naq Juvgr
To get the answer the user copy's the text Oynpx naq Juvgr from the quiz site, goes to the ROT18.com site, and pastes the text in the conversion box to get an answer.
To make it easier for users simply give them the answer as a link or text of the url like this:
http://www.ROT18.com?answer=Oynpx naq Juvgr
If they click on the link or paste the text into the browser then the answer will be pasted in text box for your user.