SalesForce Technical Questions(2).............

1. What are recursive triggers. How can we avoid the recursion problem?
2. What are Apex Governer Limits.?
3. What are the Spring’10 features?
4. How do you use an actionFunction tag?
5. What is the difference between apex:actionFunction and apex:actionSupport tag?
6. What is actionPoller?
7. How do you do FileUpload using Visualforce?
8. What is the difference between a Profile and Role?
9. What is appexchange? How can I host my application on appexchange?
10. What are the different editions available on salesforce?
11. What is batch apex. ?
12. When will we use batch apex and what is the best practice?
13. What are webservice callouts?
14. What are wrapper classes?
15. When do we use wrapper classes?