As we know, in windows phone 8, if we want to turn screen light off with app, we can call windows runtime component by p/invoke. example:
peripherally inserted central catheter (PICC) care, a nursing intervention from the Nursing Interventions Classification (NIC) defined as insertion and maintenance of a peripherally inserted central catheter either midline or centrally located. See also Nursing Interventions Classification.
PICC stands for  Peripherally Inserted Central venous Catheter .. This intravenous catheter is inserted through the skin, into a vein in the arm, in the region above the elbow and below the shoulder. This is a peripheral insertion.