[Cheeseh]

What we mean here is, i think, something like this

class CPluginBase
{
public:

...
    virtual ... Spawn (...) { // default Spawn stuff (i.e. call engine spawn etc..?)
    virtual ... StartFrame (...);
    virtual ... PlayerPreThink (...);

...
};

class CMyPlugin : public CPluginBase
{
public:
   // overridden spawn method
   ... Spawn (...)
   {
      // my plugin code
   }

   // overridden startframe
   ... Startframe ()
   {
      // my plugin code
   }

 // didn't over-ride PlayerPreThink and other stuff since we don't need them
   
};