How to restrict Parse.com API access to only one session token (one device) at a time?

I am developing an application using Parse.com as backend:

• I can login from any device with the same PFUser at the same time
• I can change anything on one device and immediately see the change on the other device.

In short, everything works great!

MY GOALS

1) Can I restrict login to only 1 device at different times?

2) If yes, how can I disconnect the previous device when entering a new one?

thank