Software Catalog 
The SAP System Landscape Directory contains component information about all the available software modules, including their combination options and dependencies. This information represents the basis for the description of the system landscape. You can get the current model data from the master component information provided by SAP.
You can also enter information about third-party products in the SLD for managing your system landscape.
The software catalog displays this information and enables you to maintain data for third-party products. This section contains information about the following:
· Modeling logic of software components and software products
· Displaying the software catalog
· Maintaining data for third-party products