Early PIC chips had a dedicated RESET pin; MCLR. Later they allowed that pin to also work as a generic digital input, giving it a name (like RE3). I am not aware of ANY PIC that allows the MCLR pin to be configured as an output. As a caveat, I do know of someone that was able to finagle the MCLR pin to act as a very low current output using the Weak Pull-Up function by turning it on and off.