Abstract: Presenting advertisements in graphical user interfaces associated with virtual computers based on user profiles and information about user activities on the virtual computers. A computer device for instantiating the virtual computers analyses user profiles and the user activity information. Based on the analysis, the computer device selects advertisements for presentation to users. The computer device includes the selected advertisements in data objects for transmittal to user terminals of the users. The user terminals generate user interface elements for displaying the graphical user interfaces based on the received data objects. The users may take actions based on the advertisements presented in the graphical user interfaces. By presenting the advertisements, the service provider of computer virtual desktop service may collect monetary compensation from advertisers.

Abstract: A license server is used for activating and authorizing operation of software components for providing desktop virtualization service. A service server installed with the software components communicate with the licensing server on a periodic or random basis. The service server is managed by a virtual desktop service provider separate from the developer of the software components for providing desktop virtualization service. If the licensing server does not send any reply messages or sends a reply message including deactivation code to the service server, the service server is disabled. The licensing server may also collect information about the use of service server to determine compliance with licensing restrictions.

Abstract: Transient virtual computers are instantiated on a server and deleted after a period of use by a plurality of users. When a request for the virtual computer is received from one or more users, the remote server replicates copies of the virtual computer and assigns each of the copies to a user. The replication of the virtual computers may involve replicating of a computer profile and associated files. Each of the users accesses, manipulates and performs operation on the assigned virtual computer as desired without affecting the operations on other users' virtual computers. After a user finishes using the transient virtual computer, the replicated virtual computer may be removed or deleted from the remote server. The replication of the virtual computer for a temporary use facilitates collaborative activities such as learning in a classroom by removing or reducing administrative tasks.