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When a client (Web browser) connects with the SAP Web Application Server (by URL call), the logon is completed in the underlying SAP System.
The section
Logging On To SAP Web Application Server describes the procedure involved and how it can be set up.
We distinguish between different concepts here:

You can also let a BSP application run under the public user and switch to an already known User ID later. You can find further information about this type of delayed logon in Note 429165 (User Switch (Delayed Logon) in the HTTP Framework).
Logging onto BSP Applicationsexplains how you can use a logon screen in your own BSP application without using basic authentication, and how you can adjust this screen individually.
