Home Curiosities: Double Doors Below a Window

I did several internet searches to identify the name of these partial double doors I see below some of our old windows but could not find the proper name.  If you know it, please let me know.  These doors would be opened after raising the bottom window creating a nearly full-sized door.  The balcony from my office can only be accessed using this partial door, which means it won’t be used at all.  All of these doors in the house have been painted shut.

How difficult would it be to restore?  I have no idea but I’d like to investigate it later in the year.  We already have at least nine doors to the outside so it isn’t a priority right now.  Once the nice weather arrives, my priorities may change though.

So unique, but what do you call them?

So unique, but what do you call them?