For the purpose of insuring proper management of federally supported computer systems and data bases, funds appropriated by this Act or subsequent Departments of Labor, Health and Human Services, and Education, and Related Agencies Appropriations Acts are available for the purchase of dedicated telephone service between the private residences of employees assigned to computer centers funded under this Act or subsequent Departments of Labor, Health and Human Services, and Education, and Related Agencies Appropriations Acts, and the computer centers to which such employees are assigned.