The Temple Institute: In-Depth Temple Study: The Two Small Openings (Pishpeshim)
 
The Two Small Openings (Pishpeshim): Uses

The Kodesh was entered through the northern small opening, in order to unlock and open the main doors of the Kodesh from the inside. 

Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII