Protected: This also allows a class to hide its member 
var. and member func. from other class objects and 
function, except the child class. it becomes important 
while implementing inheritance.
"it can be accessible into derived class with in the same 
application "
"protected members can be accessed within the class and the 
derived class"

Protected Internal: it's similar to Protected access 
specifier, it also allows a class to hide its member 
variables and member function to be accessed from other 
class objects and function, excepts child class, within the 
application. used while implementing inheritance.