To use vCenter Server with View, you must configure a user account with appropriate vCenter Server privileges. You can create a vCenter Server role with the appropriate privileges and assign that role to the vCenter Server user account.
If you install View Composer on a different machine than vCenter Server, you also must create a user account in Active Directory that View can use to authenticate to the View Composer service on the standalone machine.
If you use View Composer, you must create a third user account in Active Directory that allows View Composer to perform certain operations in Active Directory. View Composer requires this account to join linked-clone virtual machines to your Active Directory domain. See Create a User Account for View Composer AD Operations.
To summarize, when you configure View for the first time, you provide these user accounts in View Administrator:
The vCenter Server user allows View and View Composer to perform operations in vCenter Server.
The standalone View Composer Server user allows View to authenticate to the View Composer service on a standalone machine.
If you install View Composer on the same machine as vCenter Server, the vCenter Server user performs both of the preceding functions, and you do not use a standalone View Composer Server user.
The View Composer user for AD operations allows View Composer to perform certain operations in Active Directory.