plz i want a very urgent answer about 2 Qs
1. what is "middle-tier components"
2. what is "server components"
i want brief hints about each to understand what r they and how to develop these components
i want to know in which .Net moc r they
hint: is there any relation between these components and "data access layer - business logic - presentation layer"
what is the "business logic"
also if any one have any resources about these plz give me links for these resources or articles
i have been studing asp.Net - C# - xml web services lately but maybe i know or previously developed such components b4 but i dont know thier naming
so i need anyone help me ASAP
Thanks in advance