Abstract: A system for establishing an instant messaging communication channel between a first account ID and a second account ID is disclosed, wherein each of the first account ID and the second account ID is registered with a same instant messaging service, the system comprising: a database for respectively associating a plurality of identifications to a plurality of account ID(s) of the instant messaging service; and a server, configured to: associate a first account ID with a first identification in the database, obtain a same first identification from a message received from a second account ID, so as to establish an instant messaging communication channel between the first account and the second account of the instant messaging service according to the same first identification.

Abstract: The present invention provides a multi-computing environment for running applications in multiple operating environments without using virtualizations (VM) or a RDP (remote desktop protocol) server, wherein each operating environment comprises a display device and an input device; the multi-computing environment comprises: a first operating environment and a second operating environment; and an operating system, wherein each of a plurality of applications running on top of the system is respectively associated with a tag indicating a corresponding operating environment, wherein the operating system references the tag to associate an execution of each application to a corresponding operating environment of the application respectively.