This can be done by setting all other user accounts to Guest Account and then using third party software to restrict the sites and programs that Guest accounts have access to. For example, both FreshUI and TweakUI limit access to the Internet and other software on all Guest accounts. User Restrictions.
The catalytic converter is made with trace amounts of platinum, palladium and rhodium, which speed chemical reactions and help clean emissions at very high temperatures. Selling stolen converters to scrap yards or recyclers, a thief can net a couple of hundred dollars apiece.
What does a catalytic converter do? Your exhaust produces harmful emissions of hydrocarbons, carbon monoxide and nitrogen oxides that are damaging to the atmosphere if released into the air. A catalytic converter substantially reduces the amount of harmful pollutants by taking these gases and converting them into water vapour and less harmful gases via a series of chemical reactions. All petrol cars manufactured since 1993 must have a catalytic converter fitted to the exhaust.