use two different authentication backends for different types of users
135947
Django Multiple Authentication Backends Based On Status
113339
Use Windows Live ID, but login with a different password
62623
Can I have a common account across the Stack Exchange family of sites?
54152
How to give different permissions to multiple groups of users?
79329
Reorder users in django auth
128068
How can I enable multiple users login at a time in remote system?
47584
Single Sign On across multiple domains
20121
Can I start an application as another user without actually switching users?
95040
How to use different domains for multilingual sites and keep users logged in?
111166
Adding a user who can only execute scripts remotely
20946
Use one password for administration and another for system login
142282
How to associate a user to multiple scheme of a database?
57648
Manage another user's credentials for network access
5404
How can I log into two different accounts on two different sites now (July 2015)?
157302
Are user files still private when two sudo users exist in Ubuntu?
152584
Password Reset for Users on a Multisite Subsite
32348
How does Delegated Authentication and Federated authentication work in parallel?