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Furthermore, the hypervisor 130 also provides communication and interaction between the VMs 150 as if the VMs 150 were physical machines. In FIG. 1 the hypervisor 130 resides at the level of the virtual environment 120 in order to simplify the comprehension of the present aspects, although it is generally placed at the level of the kernel of the host machine 110. Moreover, the hypervisor 130 may also control access to an external network 190, such as the Internet. Therefore, the virtual machines 150 when necessary have the ability of interacting through the hypervisor 130 with external servers and services, for example, for the user to work remotely or to download necessary updates for applications installed in the client OS 155. An example of a service is the security service of an antivirus company 195, which is designed to provide updates for the antivirus system and various information, such as news about malicious file. The interactions occur through the hypervisor 130.

The protection of the virtual environment 120 against various harmful programs and applications is provided by the antivirus system, which in FIG。 1 is presented in the form of several components distributed among the VMs 150。 One component of the antivirus system resides directly in the client OS 155, namely, the antivirus agent 170, one of the purposes of which is to monitor in real time the events occurring in the client OS 155。 An example of such events might be system calls, read, write, file opening and closing operations。

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