[Q] My app on lockscreen topic

Hi!

I received the task of creating a mobile application for the company's employees where I work, but I can not allow them to access other device apps.
In Kitkat or Lollipop I can run an application in your phone's lock screen, or something?
In Lollipop is possible to pin an app, but when restart the device this functionality is ended.

Thanks and sorry. My english is by Translate :D