interview questions in DP

Hi Experts,

Can any one explain the below questions

1 .  How to extract the data from BW to Planning book (T_codes)

2.  How to extract the date from planning book to our desk top and R\3, SAP BW  (T_Codes)

3 .  what type of issues we can get in sap APO DP (Can any one share the real time issues )

4 .  why we will release forecast from DP to SNP (Purposes )and how we will release (I need T-Code, Processes)

5 .  How we will get the issues like through emails or any other way is there

6 . what is the

change request (CR)

incident request

service request

Thanks,

sandhya