1. A method of remotely controlling user access to a restricted computer resource, comprising: pre-determining an association of the restricted computer resource and computer-resource-proximal environmental information; receiving from a user requesting access to the restricted computer resource, indicia of user-proximal environmental information; comparing received indicia of user-proximal environmental information to associated computer-resource-proximal environmental information; and granting selectively user access to the restricted computer resource responsive to a favorable comparison in which the user-proximal environmental information is sufficiently similar to the computer-resource proximal environmental information.