Having to remember different passwords to sign onto various Web sites is a major annoyance in the Internet age.

On Thursday, a project aimed at ending the inconvenience by enabling a common log-in got a big boost when Yahoo Inc. unveiled plans to test the system starting Jan. 30.

The Sunnyvale company's support gives the project, called OpenID, a major backer with 248 million users. It joins a smattering of smaller Web sites including LiveJournal, Smugmug and Technorati that already have joined the fold, representing another 120 million accounts.

Tired of having to remember multiple user names and passwords for different sites? OpenID provides one sign-on that will work for many Web services. To find out more, go to openid.net and openid.yahoo.com.

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