It is quite tricky to do as the tags are generated by Links SQL code and so to show the output on external pages you either need to "connect" the pages in some way to Links SQL or "include" the output from a Links SQL page into your external pages.
If it is just the username you are after then I think the username of a logged in user is stored in a cookie
If it is just the username you are after then I think the username of a logged in user is stored in a cookie