Under the Central Vigilance Commission Act what are the functions and powers of Central Vigilance Commission?

Section 8.   Functions and powers of Central Vigilance Commission: (1) The functions and powers of the Commission shall be to-- (a) exercise superintendence over the functioning of the Delhi Special Police Establishment in so far as it relates to the investigation of offences alleged to have been committed under the Prevention of Corruption Act, 1988 or an offence with which a public servant specified in sub-section (2) may, under the Code of Criminal Procedure, 1973, be charged at the same trial; (b) give directions to the Delhi Special Police Establishment for the purpose of discharging the responsibility entrusted to it under sub-section (1) of section 4 of the Delhi Special Police Establishment Act, 1946: Provided that while exercising the powers of superintendence under clause (a) or giving directions under this clause, the Commission shall not exercise powers in such a manner so as to require the Delhi Special Police Establishment to investigate or dispose of any case in a particular manner; (c) inquire or cause an inquiry or investigation to be made on a reference made by the Central Government wherein it is alleged that a public servant being an employee of the Central Government or a corporation established by or under any Central Act, Government company, society and any local authority owned or controlled by that Government, has committed an offence under the Prevention of Corruption Act, 1988 or an offence with which a public servant may, under the Code of Criminal Procedure, 1973, be charged at the same trial; (d) inquire or cause an inquiry or investigation to be made into any complaint against any official belonging to such category of officials specified in sub-section (2) wherein it is alleged that he has committed an offence under the Prevention of Corruption Act, 1988 and an offence with which a public servant specified in sub-section (2) may, under the Code of Criminal Procedure, 1973, be charged at the same trial; (e) review the progress of investigations conducted by the Delhi Special Police Establishment into offences alleged to have been committed under the Prevention of Corruption Act, 1988 or the public servant may, under the Code of Criminal Procedure, 1973, be charged at the same trial; (f) review the progress of applications pending with the competent authorities for sanction of prosecution under the Prevention of Corruption Act, 1988; (g) tender advice to the Central Government, corporations established by or under any Central Act, Government companies, societies and local authorities owned or controlled by the Central Government on such matters as may be referred to it by that Government, said Government companies, societies and local authorities owned or controlled by the Central Government or otherwise; (h) exercise superintendence over the vigilance administration of the various Ministries of the Central Government or corporations established by or under any Central Act, Government companies, societies and local authorities owned or controlled by that Government: Provided that nothing contained in this clause shall be deemed to authorise the Commission to exercise superintendence over the Vigilance administration in a manner not consistent with the directions relating to vigilance matters issued by the Government and to confer power upon the Commission to issue directions relating to any policy matters.