It is used to avoid lock-ups during the intros or varios places in the game, or when you only want to activate codes at a certain time and not constantly have the effect of the code on. It's main purpose is to activate codes with the push of a button.
It is usually necessary to apply for DPT programs through the Physical Therapist Centralized Application Service (PTCAS). Students in DPT programs must complete a clinical internship in an area such as acute or orthopedic care with supervised experience.
Physical therapist assistants are also eligible to apply for an NPI. Once again, your facility's administration may want you to obtain your NPI for tracking purposes, but it is not mandatory for health care providers who are not covered entities under HIPAA.