CHICAGO | Online travel bookers are beginning to court group travelers, customers they previously ignored because of technological limitations. Experts say the thrust by Internet companies into the group travel market is new, but is shaping up to be a rich frontier for the highly competitive business in which bookers must distinguish themselves by anticipating travelers' needs. "Group travel is very much a nascent part of online travel," said Henry Harteveldt at Forrester Research, an independent technology and market research company. Analysts say the group travel market is too new to estimate its percentage of total Internet travel bookings.