Conundrum?

Since i'm presently fascinated by the implications of this:

Russell:

If two names or descriptions apply to the same object, whatever is true of the one is true of the other. Now George the Fourth wished to know whether Scott was the author of Waverley; and Scott was as a matter of fact the same person as the author of Waverley. Hence, putting "Scott" in the place of "the author or Waverley," we find that George the Fourth wished to know whether Scott was Scott.

For those who are still wondering what's so puzzling:

If you were crashing in your room in the afti, and someone knocked on the door then, and you wish to find out who it was later(raghu/shamu/geeta etc) then you cannot find out because your questions will be of the nature:

Is Raghu Raghu?
Is Raghu Shamu?
Who is Raghu?
etc:

:-/

Which seems to suggest that an answer to the question who knocked on my door in the afti can never be determined! :-/

That is, everytime such questions are asked, the answer that we are looking for is only obtained because of a common error in understanding :-/

I haven't found a way around it. :-?
Can anyone throw some light?
P.S: Russell mentioned that the solution he found to this puzzle has implications on the foundations of mathematics and the relation of thought to things. He mentions to the addressee that the "answer" would be published in an article in a forthcoming journal, but he never mentioned which one in the letter! :(