Credit Union On-Line, Inc., a data processing provider, has appointed the following new employees: John Tandy, MIS/operations specialist; Kathy Melchione, computer operator; John Carignan, computer operator; Cecelia Linn, operations supervisor; Stephanie Dunn Hyles, vice president of systems/operations; Karen Hatch, account executive; and Christopher S. Penn, MIS manager. AssetExchange, a national network of banks and financial institutions that buy and sell loan portfolios, has appointed J. David Bartoo vice president/portfolio manager. BlueSuit, Inc., a provider of brokerage and related financial services, has named Bob Vosburgh president/CEO.