With AS ABAP-based SAP systems you can choose to communicate by either the SAP GUI or a web browser. You can consult the Product Availability Matrix (PAM), for example, to find out which web browser types are supported.
Web browser navigation is used under a range of different conditions:
You log on to the SAP system with the SAP GUI for HTML. SAP GUI for Windows is not required. Navigation takes place via the web browser, only.
You use an SAP GUI for Windows with the SAP system, for example. Some transactions open in a web browser. In all SAP systems, the transaction PAL (Printing Assistant for Landscape) opens in a web browser. In an SAP Solution Manager system, for example, this is the case for transaction LMDB (Landscape Management Database).
You call a web browser-based web service of an SAP system.
The URL for the web browser-based call starts with http(s)://<host name of application server:<Port ppnn>. pp is a number that can be defined by a profile parameter, for example 80 for http or 443 for https, nn is the instance number, for example 11. The URL could therefore begin with https://fsdhost.wdf.sap.corp:44311.
AS ABAP via Web Browser
As users always exist per client in AS ABAP, and are therefore client-dependent, the system prompts you to enter the client at log on.