Explanation:

IPL – Intial Program Load (IPL) is the process of loading of Operating System (booting) in a mainframe computer. Short for initial program load, the process of loading the operating system of a mainframe into the computer's main memory. IPL is the mainframe equivalent of booting or rebooting a personal computer. IPL-based technology is generally considered a safe procedure as potentially harmful ultraviolet radiation is typically filtered by blocking wavelengths below 500 nm, although there are unwanted effects associated with the treatment.