The Immigration Appeals Board is an independent, court-like administrative body that acts as an appeal body in aliens' cases. The Immigration Appeals Board does not deal with cases involving asylum, but instead with complaints concerning decisions on family reunification, permanent residence permits, and administrative deportation / rejection, etc.
At a board meeting, there are always three board members who decide a case: a judge, who acts as chair of the meeting, and two members who are nominated by the Bar Council and the Ministry of Immigration and Integration.
Normally, the applicant would not appear before the Immigration Appeals Board, as the board processes cases in writing. Applicants are not entitled to a lawyer in the same way as in the Refugee Appeals Board.
You can visit the Immigration Appeals Board's website here (the site is in English):