USERNAME -- your login username
Foswiki makes names available in three formats: USERNAME like
jsmith, WIKINAME like
JohnSmith and WIKIUSERNAME like
Main.JohnSmith. Un-authenticated users are all
WikiGuest.
This macro is an alias for the USERINFO macro with a fixed
format="$username".

The login username is considered "protected"
information by default and will not be revealed to non-admin users.
Parameters
Examples
-
%USERNAME% expands to guest
-
%USERNAME{AdminUser}% expands to == 
When used in a template topic, this macro will be expanded when the template is used to create a new topic. See
TemplateTopics for details
REMOTE_USER,
USERINFO,
WIKINAME,
WIKIUSERNAME,
UserAuthentication