Are student papers treated differently from main papers in a top conference?
In my area of research there is no special category or process for student papers. All papers are submitted using the same process and the overwhelming majority of conferences uses double blind peer-review.

By design this implies that reviewers should not even be aware whether a paper was written by a student or not. Also during conferences, all papers are treated exactly the same.

The only thing I can think of that's special for papers written by students is that some conferences offer a special "Best Student Paper" award, for which - naturally - only student papers are eligible. (What defines a student paper can differ between conferences.) But these awards are decided after all accepted papers have been chosen and do not influence acceptance/rejection.