Passing additonal data to licensing server.

Hello,

I have a question regarding additional data. I've read that during activation I can pass to license server additional data, like e-mail or user name, etc. And I would like to know:- if it is possible to pass additional data to custom license fields?- if it is possible to pass additional data in some time intervals (both to standard additional data license field and to custom license field) and not only during activation?

Kind regards