Which functions to use? (dlindbergh)

I'm confused about similarly-named functions in Harmony. To give an example, what is the difference between these 4 functions? 1 - SYS_PORTS_PinPullUpDisable() 2 - SYS_PORTS_PullUpDisable()3 - SYS_PORTS_ChangeNotificationPullUpDisable()4 - PLIB_PORTS_Cha..