We will have a seeing impaired student in the Fall and it's been suggested we use more informative labels on graphs, including the assignment set id and problem number. Is that available in writing a problem? I.e. is there some variable in the environment like $SET_ID that can be called in the code for a problem?
The set name is
$setNumber and the problem number os $probNum or questionNumber
You can find out all the variables available to you by loading PGinfo.pl and issuing the command
listVariables();
This will print out all the variable names and values, plus the form values sent to the page by the last submit or check-answer button press.