In a suit instituted against a public officer in respect of any act purporting to be done by him in his official capacity-
(a) the defendant shall not be liable to arrest nor his property to attachment otherwise than in execution of a decree, and,
(b) where the Court is satisfied that the defendant cannot absent himself from his duty without detriment to the public service, it shall exempt him from appearing in person.
76 CPC Commission to another Court
78 CPC Commissions issued by foreign Courts
79 CPC Suits by or against Government
81 CPC Exemption from arrest and personal appearance
84 CPC When foreign States may sue
85 CPC Persons specially appointed by Government to prosecute or defend on behalf of foreign Rulers