Have the students already logged onto the computer/domain when they run this Access application? Or do they share a system?
I ask because most people starting out believe they need the operator to sign in
again. Into the Access application. In most cases that is both unnecessary and introduces many security problems. Problems you really don't want to be responsible for introducing.
You can retrieve the UserID of the operator from within Access (See
Function to Return UserName (NT Login) of Current User). You can store information for each supported user in a local table to handle who can do what. The Primary ID of that table (obviously) would be the UserID you've got from the OS.
An example of such usage, albeit fairly full-featured, can be found at
How To Create User Permissions and Customized Menus in MS Access. Bear in mind that's just one example. It can provide you with a number of ideas for your project, but do make sure yours fits what
you want/need.
Avoid user login forms like the plague. They can be almost as damaging to you in their own way.