[Elecraft] Who is P40A?

[Darwin, Keith]

Last night on 40 meters, there was a pile up on this S9+20dB signal.  He
was sending pretty fast - P40A (or was it P40N?).  I gave him a call.
He came back to another station.  After the next QRZ, I called, paused
then called twice.  He came back to me ...
 
KD1E?
 
I answered KD1E KD1E 5nn 5nn BK
 
He answered KD1E?
 
I slowed just a bit and repeated KD1E KD1E KD1E  5nn 5nn 5nn BK
 
KD1E QSL 5nn TU.
 
So who is this?  A DXpedition?
 
And more importantly where do you find info on stations like this - you
know, the ones with the odd calls that appear and disappear from time to
time.
 
- Keith KD1E -
- K2 5411 -