Tempory Varibles

Hi, I am successfully using the hints file to manipulate the User-Name of a subset of users by matching on their realm name. The hints file allows be to drop these User-Names back to a single common name and to authorize with. What I want to be able to do now, is to store a copy of the original User-Name value in a varible so that I can subsiquently use this in the postauth SQL logging and record the original value rather than the value altered by hints. What would be the best way of doing this? I just want to drop the value into a tempory varible really. Kind Regards Ben