A compound of formula wherein A1, A2, A3, A4, R1, R2, R3 and R4 are as defined in claim 1; or a salt or N-oxide thereof. The method of the present invention includes loading a first computer program into a SIM card and loading a second computer program comprising a software tool for designing test, measurement, and control systems into a computer. The entries store characteristics of the common side information and include a reserve counter whereby entries can be reserved so that they are not erroneously deleted from the server. The current control program in the rewritable memory is easily rewritten to the new one of the control program sent from the host computer.