Differentiate between the user mode and monitor mode.

- User mode and monitor mode are distinguished by a bit called the mode bit.

- User mode uses bit 1 and monitor mode uses bit 0.

- At the boot time hardware starts with the monitor mode.

- Also, at the time of interrupt user mode is shifted to the transfer mode.

- System always switches to the user mode before passing control to the user program.

- Whenever system gains control of the computer it works in monitor mode otherwise in user mode.