TCO is short for "Tjänstemannens Central-Organisation". Since 1992, this umbrella organization of 20 swedish unions establishes the limits for screen radiation.
MPR-II: Swedish norm with limits for electromagnetic and electrostatic fields.
TCO 92: Oldest of the present TCO norms, tightens the measures for the MPR-II norm and includes requirements in terms of refresh rate and energy saving.
TCO 95: Goes beyond TCO 92 and additionally includes criteria for environmentally acceptable production and disposal of all of the computer's components including keyboard.
TCO 99: latest norm, further tightens the norms above, i.e. demands a refresh rate of at least 85 Hz for a 17 inch monitor and limits the power consumption in standby mode. Among other things, it also tightens the measuring conditions and limits for electromagnetic radiation.
TCO 03: is the currently most up-to-date norm and exceeds the TCO 99 norm.
Those who are lloking for very detailed information on this topic can visit the TCO's website at www.TCO.se. The page is available in English and Swedish.