Paging Network Inc., the world's largest paging company with about 8.4 million customers, was forced into U.S. Bankruptcy Court by investors who say the company owes them $3.49 million in bond payments. In an involuntary Chapter 11 petition filed in Wilmington, Del., executives of Everest Capital Ltd. of Hamilton, Bermuda, asked a judge to resolve the Paging Network's past-due payment situation. Nasdaq halted trading in shares of Dallas-based Paging Network, which last year agreed to be bought by Westborough, Mass.-based Arch Communications for $1.36 billion. A spokesman for the company said it plans to respond to the petition. Shares of Paging Network last traded at $1.09, down 22 cents.