I'm building a site where I'll have multiple MT users browsing content. I have a pages set up that will only display the content when a user is signed into a MT account. I got that feature working. I eventually have a php mail trigger to send me information when certain events occur. I would like this php generated email to include the user that loads the trigger. I have always been able to include other movable type templates in the scripts, but all the other ways that display the user signed in seem to be javascript. Is there a template tag for the signed in user?
Thanks
Using MT 5+
Reported on Movable Type 5

When a user is signed in you can refer to the contents of the cookie `mt_blog_user` (which includes their name). Alternatively, if you're publishing a template, when a user is loaded the Author-context tags are populated, so <mt:AuthorDisplayName> will correctly show the authors name.