How many types of Technical Systems and Explain it?

Technical Systems are categorized in to

1.Web AS ABAP
2.Web AS JAVA
3.Standalone Java
4.Third Party
5.SLD


1.Web AS ABAP : All the sap Systems are defined as Web AS ABAP.

Ex:APO,CRM,BIW,SRM,R/3.....

2.Web AS JAVA: Any Enterprize Applications based on Java is defined as WEB AS JAVA.
Ex:EJB.

3.Standalone Java: The file Systems Standalone Java Sys's are DB Systems http & mail
Servers.

4.Third Party: All the Non-sap ,Java Sys's are defined as Third Party.
Ex: BAAN,Siebel,Peoplesoft.....

5.SLD: SLD is to access the External sys Landscape Directory.

Ex:using two different SLD(Company1,Company2) .