Do we have different user login for different Appian domain/account

1. No, you don't. Appian is has Role-Based security. So you can attach Security Groups (which represent the Roles you wish Users to play in your Application) to your Applications, and add the same User account to as many Security groups as you wish, so that they can play one or more Roles in one or more Applications
2. If you're using Appian's default User environment (Tempo) all of your Applications will share the same base domain/URL. If you expose your applications as Appian Sites then the domain remains the same but the URLs will be specific to the Site(s) that the Users have access to
3. [see 1.]
4. User Accounts are unique (but case sensitive). If you try to create a new User Account with the same UserId as one that already exists then you will not be allowed to. Note regarding case: stewart.burchell is NOT the same as Stewart.Burchell so we recommend you adopt a standard format e.g. all lower-case email addresses

 Hi Husain,

if you create two different application under same environment there is no need to create separate appian account for each application

1. Do we need to create separate Appian account for each application :  No
2. Do Appian provide different domains/URL to access those applications (with common Username/Email ID) :  y ou can use different site/application URL for accessing those application on common username and pwd
3. How user can access multiple application witth the same Username/Email ID: we have separate URL for accessing the application
4. If user already used any other existing Appian application and when we try to create same user for our application it should not prompt us "User already exists": No need create different user same name, existing user is fine to access both the application.

Hope it will help to you.

Regards,

Bhanu.