abap

1.How to check the Syantax error in debug?

2.what is the diff between Interactive and Alv?

3.In o/P format Sales no 1 to 10 is there same customer.I want dispaly sales no 1to 10 oneCustmoer no .How to write the Code?

4.In the report intilalization and load programmer is there once excute the pgm which event will be trigger?