1. A file system driver program executing on a local computer, comprising: one or more agent procedures executing on the local computer to access file resources on behalf of a target process executing on the local computer; and a security process executing on the local computer that regulates the access of the file resources by the agent procedures, wherein the security process regulates the access of the file resources by the agent procedures based on a property that is unique to the target process such that the agent procedures can access the file resources on behalf of the target process and the file resources are not visible to processes executing on the local computer other than the agent procedures and the target process.