define three types of kernal-mode to user mode transfers Solution 1.Multitasking ; In order to excute multiple jobs , process switching is needed some times.In order to load programmes CPU moves from kernal mode to user mode 2.Interrupt handling ; Modern architectures are interrupt driven.When an interrupt occurs, the hardware automatically switches a part of the context (kernal-mode to user mode or usermode to kernal-mode) 3.User and kernel mode switching ; A transfer between user mode and kernel mode is required in an OS, then user and kernal mode switching takes place ..