A thermal interface device comprises a film of thermal grease intended to be inserted between a first object and a second object, and a microporous seal encircling the periphery of the film of thermal grease. In an embodiment, network flow information for a network flow between a first endpoint and a second endpoint is received from a network device interposed between the first endpoint and the second endpoint, wherein the network flow information includes at least an address for the first endpoint and a particular payload identification number. A processor operatively associated with the then-currently deactivated mobile unit recognizes the mobile unit identifier contained in the broadcasted message. The sheet of material is heat sealed along sides of the sheet and by a cross seal in a portion of the sheet to form the first and the second pocket.