Comcast Corp., the largest U.S. cable operator, will offer some television shows over the Internet to a test group of subscribers in the coming weeks, Chief Operating Officer Stephen Burke said.

Comcast is teaming up with Time Warner Inc. on the feature, called OnDemand Online, Burke said in an interview. The cable operator plans to offer it to more customers by the end of the year, he said.

Comcast will conduct a trial with several programmers, including New York-based Time Warner, in coming weeks. Cable subscribers will be able to log onto to Comcast's Web site with a password to get the shows, compiled from some of Time Warner's channels. Time Warner spokesman Ed Adler confirmed that the companies are in negotiations and may complete a trial run soon.

The company is working to make the log-ins secure and add shows from other networks, Burke said. Once programmers see there's a secure authentication process in place, more probably will sign on, he said.

Time Warner Chief Executive Officer Jeffrey Bewkes has been championing "TV Everywhere," his company's online TV initiative, as a potential model for the industry.