Authorization and Authentication in Shared Lists
In order to share a list through SharePoint Services, an author must have privileges on the SharePoint server. SharePoint provides an easy-to-use interface for adding users and maintaining their passwords, shown in Figure 14-4.
When a user shares a list from Excel, SharePoint authenticates the user with the Connect dialog box, shown in Figure 14-5.
Once the user is authenticated, Excel maintains a session for the user for a period of time determined by the SharePoint settings so that the user doesn’t have to sign in again every time he accesses a shared list. When the user closes Excel, his SharePoint session is ended and he will be reauthenticated if he starts Excel and accesses a shared list again.
These same rules apply whether the user is accessing a shared list through the Excel user interface or through Visual Basic code.

Figure 14-4. Use the SharePoint Add Users page to add new user accounts and set user privileges

Figure 14-5. SharePoint authenticates users before connecting to a shared list
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