3-Tier Setup components in MSD Axapta

3-tier setups are somewhat more complex and come with some interesting twists, so let’s look at what they are made of:

Application: This is where all the business logic and metadata definitions reside—form, report, menu definitions, etc.

Application Object Server: This is where the application is executed and data access is performed in “thin” mode.

Client: This is where interaction with the end user is handled and data access is performed in “fat” mode.

Database: This is where all business and system data is persisted.