About Technical & Business System

Hi,

There are Technical & Business systems like

1) Web as ABAP

2) Web as Java

3) Stand alone java

4) Third Party

5) System Land scape Directory

Can i know in which situation we use the different types of technical & Business sytems. Can any body explain with scenario's in which situatuation we use Web as ABAP, in which situatuation we use Web as Java, in which situatuation we use standalone java, in which situatuation we use Third Party & in which situatuation we use System Land scape Directory.

Thanks in advance.

Regards,

Prem.S