1. What is high debugging?

it is helped to recure the bugs. a program has problem that
time this debugging is helped to solve the bugs is easily,
this is the method of the recure bugs in the programming
language

3. What is BDM, and what is its use?

Background Debug Mode (BDM) interface is an electronic
interface that allows debugging of embedded systems.
Specifically, it provides in-circuit debugging
functionality in microcontrollers. It requires a single wire
and specialized electronics in the system being debugged. It
appears in many Freescale Semiconductor products.