"The EmailManager class has a public method (sendMail()) that sends email and uses built-in Messaging methods of the Apex class library. Also, this class has a private helper method (inspectResults()), which can’t be called externally because it is private but is used only within the class. This helper method inspects the results of the email send call and is called by sendMail()."

I'm wondering where you can find a description of some of these and other methods. i.e. SendMail(), InspectResults(), etc. Any help would be great.