abap

1.In Report i haaad declared the parameter only.In selection screen i hadn't given the input value directly i will execute the report what will be happen?

2.In Report i haaad declared the select-options only.In selection screen i hadn't given the input value directly i will execute the report what will be happen?

3.What is the version management?use

4.for all enteries command expiain briefly

5Select single and select up to 1 row explain briefly

6.synchoronous and asychoronous difference?

7.In Bdc 10 records is thereIn pgm loop at itab to endloop.But in the transaction I'st record only display remain records not display what will be happen?