How do I test to see if a variable exists, on a TI-83? TIA. Ted Behling - webmeister@cyber-wizard.com - Hilton Head Island, SC Monarch Information Systems, Computer Consultant QBasic & Windows 97 mailing lists - Moderator (See the websites to join) Win97: http://rdz.stjohns.edu/win97 | QBasic: http://rdz.stjohns.edu/qbasic