Hart said that what had happened between his predecessor and Buszaky was history and the Hungarian still had a part to play at the club.
"Akos Buzsaky is the same as all the players here," he said.
"They all come into reckoning - we have people out on loan, and we have to consider if they can help us. Everyone's back in the frame."
Youth coaches Steve Gallen and Marc Bircham were in charge for Monday's 2-2 draw at West Brom but Hart now becomes the ninth manager in just over two years since Flavio Briatore took over as chairman in August 2006.
Permanent bosses John Gregory, Luigi De Canio, Iain Dowie, Paulo Sousa and Magilton have all departed while Harford, Gareth Ainsworth (twice) and Gallen and Bircham had spells as caretaker managers.
Hart inherits a team lying 12th in the Championship, just three points away from the play-off places, having been out of the game for less than a month since leaving Premier League strugglers Portsmouth.
He has also had spells in charge of Chesterfield, Nottingham Forest, Barnsley and Rushden & Diamonds.
Harford left his position as manager of Blue Square Premier side Luton by mutual consent in October after a difficult time in charge of a club deducted a total of 40 points in two seasons for financial reasons.
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