Abstract: A data management server manages access tokens for accessing remote storage service servers. The data management server sends the access tokens to user terminals to enable the user terminals to communicate directly with the remote storage server to upload data to the remote storage service server or download data from the remote storage service server without routing of data traffic through the centralized data management server. The data management server initially communicates with a remote storage service server to open an account for a user and obtains an access token for accessing the account in the remote storage service server.

Abstract: A data management server manages access tokens for accessing remote storage service servers. The data management server sends the access tokens to user terminals to enable the user terminals to communicate directly with the remote storage server to upload data to the remote storage service server or download data from the remote storage service server without routing of data traffic through the centralized data management server. The data management server initially communicates with a remote storage service server to open an account for a user and obtains an access token for accessing the account in the remote storage service server.

Abstract: Each of a plurality of user is given access to replicated version of a virtual computer. The replicated virtual computers are generated by copying a computer profile of an original virtual computer and associated files of the original virtual computer. 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 replicated virtual computer, the replicated virtual computer may be deleted from the remote server or stored as the user's virtual computer. The user can store multiple versions of virtual computers, some of which are based on replicated virtual computers.