ZAN Controller described a confused hand off event; claiming automated coordination between ZAN and CYVR is lacking and needs to be established.

Narrative

I was working Sector R8 at ZAN. Fifteen to twenty minutes after taking the sector; an aircraft; enroute to KTN; called me looking for lower. The aircraft was about fifty miles southeast of my sector boundary and still inside CYVR's airspace. I checked the flight strip and saw that he intended to land in KTN; issued a pilot's discretion descent to 080 and issued the KTN altimeter setting. Several minutes later a CYVR Controller called and asked me if I was talking to the aircraft. I responded that I was and that he was issued a descent to 080. The CYVR Controller said he had 'just sat down' and was confused about the aircraft because he didn't show a descent issued or a hand off made with ZAN. The pilot had switched frequencies without permission from CYVR. Recommendation; ZAN and CYVR share RADAR data in the KTN area but are required to make manual hand off's. When looking at a target on the scope; it appears that ZAN has taken the hand off as soon as the target appears. Automation between the two facilities would prevent future events as the one previously described.