Configuring SAPGUI on the client PC.
The client computer is configured via the SAP GUI system properties wizard. The system properties box for SAP 7.10 looks as shown below:

This system properties dialog box contains the following information:
The description can be literally anything. Typically, this is either the name of the SAP server or the GuiXT Server that the user will connect to. In our example, the description is ‘GuiXT Server’.
The application server is the name of the application server the user will connect to. In our example, the application server is named ‘TEST’.
The system number is the system number of the application server. In most real-world cases, this will be ‘00’ as in our example.
The System ID is the SAP box to which the Server will be connecting. The System ID can be different depending on your corporate environment. Some examples might be ‘DEV’ for development, ‘QAS’ for regression testing or ‘PRD’ for production. Each of these can have specific data and restrictions associated. For example, development might be prohibited in PRD so as not to risk damaging the production system or data.
The SAP Router string contains the actual IP address of the application server. However, you will only enter a SAP Router string if the GuiXT Server will be used as a SAP Router. Using GuiXT Server as a SAP Router is explained below. Leave this blank for a standard GuiXT Server connection.