Profiles seven young people with the Internet expertise and talent sought by those involved in the computer network world. Frank Sikernitsky, the editor of Trinity College's World Wide Web magazine; Christa McHugh, a consultant; Joseph Riewerts, a stock picker; Andrew Heitner of New Frontiers Information Corp.; Steven Chapin of Vision Internet Providers; Bart Decrem of Plugged In, a nonprofit organization; Hank Leukart, author of the book `The Doom Hacker's Guide.'