Getting User from Web enabled form

[£ukasz Pietrzak]

Is there any way to get user from form, that was published on Sharepoint
2007 (beta) and is web enabled?
I used managed code and
System.Environment.UserName

and
this.Application.User.UserName

but this only works if I use Infopath to fill the form.

When I use Office Forms Server 2007 (beta) to display the form, fields which
I used to display username are blank.