BUSINESS MEMO: SECURITY SYSTEM AVAILABLE

General Motors Corp. will equip its Cadillacs with a new satellite-linked car security system that will automatically summon help if the car's air bags are deployed in an accident. The OnStar system will be available on most 1997 Cadillacs for about $1,000 plus a monthly service charge, GM said Friday. A hands-free cellular phone will link motorists with a team of GM operators...