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PF.Net Communications Inc., a closely held company that’s building a fiber-optic network, named former Global Crossing Ltd. Chief Executive Robert Annunziata its chairman, effective immediately. Annunziata, 52, had joined Global Crossing in February 1999 from AT&T; Corp. and resigned in March. . . . SBC Communications Inc. and Prodigy Communications Corp. combined their Internet businesses, giving the No. 1 U.S. local-phone company a 43% stake in Prodigy and a well-known brand for its data services.