C / C++ / MFC

1.IS IT TRUE in any case code of DLL is not duplicated?
2.Although as u said at first instance it may need relocation BUT wat if the next process also needs DLL to be relocated?
3.Is it like this that DLL uses data of the process associated with it at that time

typedef int key; // non-templated<br />
<br />
class heap<br />
{<br />
  public:<br />
    heap();           // Default constructor<br />
    heap( xxx );      // Parameterized constructor [heap( max ) heap( min ) ]<br />
    // Copy constructor and destructor are automatic<br />
    virtual  int size()     const;<br />
    virtual bool is_empty() const;<br />
    virtual  key top()      const;<br />
    virtual void insert( const key &new_key );<br />
    virtual bool remove() // delete the top item<br />
  protected:<br />
    virtual void rebuild( int root ); // on delete of top()<br />
    virtual void rebuild();           // to trickle up on insert()<br />
  private:<br />
     <br />
}