SAN FRANCISCO — Schwab Corporate and Executive Services, a division of Charles Schwab & Co., has added several features to its stock option management Web site.

Employees of companies that offer stock options and purchase plans can now use the Schwab OptionCenter to access to real-time information about their vested and unvested options. They can also receive alerts about important information, such as impending expiration of stock options.

Schwab has also added a KnowledgeCenter seminar area to the site, as well as access to a library of articles about stock options. The latter is offered through a licensing agreement with myStockOptions.com.

And the company added two modeling tools, Cash Calculator and Future Cash Calculator, to the four already available at the site. All the additions were announced last week.

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