But for legions of Google heads, the fact that it feels like a science project adds to the allure. Working versions of Chromium have appeared across the Web and have been downloaded more than a million times. By all accounts, the most popular and functional have been on the Web site of a 17-year-old in Manchester, England, who goes by the Internet handle “Hexxeh.”

Liam McLoughlin, as Hexxeh is known to family and friends, is a college student and programmer who has taken Google’s Chromium code and compiled it so the operating system can be downloaded to a separate USB memory stick, which can then be used to boot up a computer. He has spent countless evenings and weekends configuring Chromium to work on various kinds of computers, including the Macintosh, and added features that Google has not gotten to yet, like support for the Java programming language.

He explained that his work on Chromium began partly as a way to demonstrate his computing skills and possibly open doors in the technology industry. It also sprang from an interest and belief in Google’s computing vision. “Many people don’t care about how PCs work and all the security software that comes with today’s computers. They just want to use the Internet,” he said.

Since last fall, a small but vibrant community has formed around his work, encouraging him with ideas and supporting his efforts by providing money for servers and other programming tools.

Steve Pirk, a former systems engineer at the Walt Disney Company and now based in the Seattle area, helped to support a coding marathon this year by donating $50 via PayPal, which Mr. McLoughlin spent on a supply of highly caffeinated Jolt cola.

Mr. Pirk said he tested Hexxeh’s resulting software, code-named Flow, on a half-dozen computers; all functioned properly running Chromium from a USB drive. He says he looks forward to the day when low-powered but fully functional computers running Chrome can help lead to a new wave of telecommuting. “The more work we do in the cloud, the less need there is for people to be in physically secure network environments,” he said.