query regading xbee xb24-zb

MY FIRST QUESTION IS REGADING ENERGY SCAN. WHY XBEE REJECTS CHANNEL WITH EXCESSIVE ENERGY?

DURING ESTABLISHMENT OF COMMUNICATION BETWEEN TWO MODULE USING API MODE, CONSIDER ONE IS A ROUTER WHERE AS OTHER IS A COORDINATOR, WHICH ONE IS PLACED AS A AT AND WHICH ONE IS PLACED AS A API.

WHAT IS API IDENTIFIER?

WHEN WE PLACE ONE MODULE IN CO-ORDINATOR API WHILE KEEP OTHER AS A SAME, IT DOESN’T SET SOME TIMES. IT SHOWS WRITE PARAMENTER FAILS.

IN API MODE COMMUNICATION WHY WE PLACE ONE MODULE IN API WHERE AS OTHER IN AT MODE?

WHAT IS SIF HEADER INTERFACE? I WANT TO KNOW ABOUT IT DO U HAVE ANY DOCUMNTATION?

WE ARE USING XBEE PRO-ZB, VERSION: XB24-ZB, IS ESTABLISHING COMMUNICATION IBETWEEN TWO CO-ORDINATOR IS POSSIBEL? OR MESH NETWORKING IS POSSIBEL?

IS THERE ANY SPECIAL PROCDUER FOR IMPLEMNETING ADHOV ALGORITHM IN API MODE? DO U HAVE ANY DOCUMENTATION? WE ARE USING XB24-ZB.

WHAT IS THE DIFFERENCE BETWEEN OPERATING PAN ID, OPERATING 16 BIT PAN ID, OPERATING CHANNEL?

WHAT IS ZIGBEE STACK PROFILE?

Is this by any chance a homework problem?