Sigma Web Framework Logins tab

The Sigma Framework Login Screen allows an administrator to configure usernames and passwords and access levels to the program. This screen is accessed after login by clicking on the System tab, and then clicking the Login tab (as needed.) The Login screen is available ONLY to users who have been given admin rights to the system. Otherwise, attempting to access this screen will result in a Permission Denied screen.

The Login screen is depicted below.

The Login tab is a standard Sigma dialog box. To add a new login entry to the system, the user clicks on the AddNew button. To edit an existing login entry, the user clicks the Edit button, followed by the Commit button on the edit screen. To delete an existing login entry, the user clicks the Edit button, followed by the Delete button on the edit screen. Selecting an option from the Sort By menu, and then clicking Apply can sort screen fields. By default, logins are sorted in the order in which they were added to the system.

As part of each login, the administrator specifies an "Access" level of "admin", "user", "guest", or "disabled". These settings affect the particular login, limiting access to the Sigma framework as follows:

• Admin Access. Administrators are permitted access to all screens of Sigma, including the Login screen above. No checks are applied to logins with "Admin" access.
• User Access. Users are permitted access to most screens, except for any screen in the System tab, such as the screens in this section. Users may also have limited access to specific Sigma Framework applications, as determined by the application designer. (Refer to specific applications manual for more details.) Generally Users are permitted to edit configuration data.
• Guest Access. Guests are permitted to access most screens, but are not permitted to edit or change any configuration data on the system. Guests cannot access Edit or AddNew buttons on any screen. Application designers can override this. 
• Disabled Access. Disabled users are not permitted access to Sigma. Attempts to access any screen within Sigma is immediately stopped. This has important implications for security, and works with the "Default User" parameter setting discussed in a later section.