Eric Schmidt and Bill Gates.

As Google executive chairman Eric Schmidt prepares to testify Wednesday before a Senate panel about antitrust concerns related to the company's search methods, he'd do well to look to Bill Gates' testimony during a similar hearing 13 years ago.

Gates sometimes arrogant demeanor and evasive responses received a mixed review as he testified before a Senate hearing on antitrust issues related to Microsoft's then-dominance in the computer operating system market in 1998, reports Fortune.

Schmidt would do well to be confident, to the point, undramatic and polite as he fields questions on how Google produces search results and whether it favors its owns businesses and engages in anti-competitive practices.

Google is the focus of a number of investigations, including the Federal Trade Commission inquiry that centers on its Android operating system and online search methods.

The hearing starts at 2 p.m. today and is not intended as a step toward building an antitrust lawsuit, but to explore questions around antitrust concerns related to Google's dominance in search, according to the New York Times.

Some of Google's rivals are expected to speak at the hearing, including executives from Yelp and Expedia.

Concerns about Google's dominance increased when it acquired travel software company ITA last year. The Justice Department approved the merger in April with conditions to prevent Google from preferencing its own travel services and allow rivals would continued access to ITA's data.