As was described here, there were the upper hokumen and lower hokumen, and the upper (shau) were stationed in the two rooms in the court, and there were tenjobito (persons who were allowed to enter the Emperor's residence).
そこにいわれるように、上北面と下北面があり、上（シャウ）は殿上の2間が詰所となって、院の殿上人。