In a computer system including a computer terminal, an operating system installed on said computer terminal, a virtual machine running on the operating system, a server communicatively coupled to the computer terminal and a process including instructions that when executed on a virtual machine define a user interface; a Single Sign On (SSO) system comprising a database of authentication credentials accessible to the computer terminal, and instructions executable on the virtual machine operative to: obtain user interface state data from the process; query the virtual machine to obtain component data related to the user interface state data; and manipulate the component data so as to deliver authentication credentials to the process.