28. The computer system of claim 27 , wherein the request format comprises: at least one instruction and data to be used when performing the at least one instruction.
29. The computer system of claim 28 , wherein the instructions further comprise: first including instructions to include an optional variable in the at least one instruction of the second request; and second including instructions to include a value of the optional variable in the data of the second request, wherein the optional variable and the value specify use of a specific feature of the first device.