Accessibility

Global classes and class members each have an accessibility that specifies which other classes can legally access them. They are:

Message Form	Data Form	CIL Equivalent	Available To
public	#Public	Public	All classes
qualified	#Qualified	FamOrAssem	Any subclass, and any class in the same assembly
restricted	#Restricted	Family	Subclasses
secret	#Secret	Assembly	Classes in the same assembly
supersecret	#SuperSecret	FamANDAssem	Subclasses in the same assembly
topsecret	#TopSecret	Private	The declaring class only

It's easy to remember these. Accessibilities with "Secret" in the name confine member access within the assembly, while the others are accessible to referencing assemblies, at various levels.

For global classes, the only two allowed values are #Public and #Secret.