Thread: Inheritance question

Code:

class Foo{
public:
};

class Poo : public Foo{
     // local variables
public:
     // Accessor/Mutator
};

class Boo : public Foo{
     // local variables
public:
    // Accessor/Mutator
};

If I passed a reference or pointer of Foo into another class, how am I to access Poo and Boo members through Foo?