18. The at least one non-transitory computer readable storage medium of claim 15 , wherein the manifest comprises a program integrity data for the first client program of the one or more client programs identified in the manifest, wherein the client program execution procedure is configured to evaluate the program integrity data to detect a modification to the first client program.
18. The at least one non-transitory computer readable storage medium of claim 15 , wherein the manifest comprises a program integrity data for the first client program of the one or more client programs identified in the manifest, wherein the client program execution procedure is configured to evaluate the program integrity data to detect a modification to the first client program. 19. The at least one non-transitory computer readable storage medium of claim 18 , wherein the client program execution procedure is configured to compute a new program integrity data for the first client program, wherein if the program integrity data does match the new program integrity data then execution of the first client program is blocked.