Whether a stranger can be permitted to file a civil appeal in any proceedings?

Section 96 and 100 of the Code of Civil Procedure provide for preferring an appeal from any original decree or from decree in appeal respectively. The aforesaid provisions do not enumerate the categories of persons who can file an appeal. However, it is a settled legal proposition that a stranger cannot be permitted to file an appeal in any proceedings unless he satisfies the Court that he falls with the category of aggrieved persons.