EXHIBIT 4.2 REGISTRATION RIGHTS AGREEMENT REGISTRATION RIGHTS AGREEMENT, dated as of April 1, 1999, by Nucentrix Broadband Networks, Inc., a Delaware corporation (the "Company"), for the benefit of the persons listed on Annex A hereto (the "Initial...Registration Rights Agreement • December 16th, 1999 • Nucentrix Broadband Networks Inc • Cable & other pay television services • Delaware
