| 摘要 |
A network system includes an access control device and a client device. The access control device provides access to an enterprise network using a virtual private network (VPN) and provides a software update package to the client device. The client device includes an operating system that maintains a user context for a user having restricted privileges and a system context having elevated privileges. The client device further includes a user-level setup module, a system-level installation service and a user-level installation service. The setup module, system-level installation service and the user-level installation service interact to provide on-demand advertisement and installation of authorized software update packages on computing devices when needed by the user without requiring action by an administrator.
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