Also. . .

* The California Public Employees’ Retirement System said it will more than double its investment in activist fund Relational Investors, to about $500 million.

* UAL Corp., parent of United Airlines, bought a minority stake in Palo Alto-based Internet Travel Network, a travel software company, for undisclosed terms. Closely held Internet Travel Network said it will use proceeds from the sale to expand its business and presence on the Web.