The School is living memory. Each door is one dhāraṇā of the Vijñāna Bhairava Tantra, a way of resting attention that Bhairava describes to the Goddess. Door N is dhāraṇā N in Jaideva Singh's numbering, so Door 001 is verse 24 and Door 112 is verse 137.
All seven houses are open: doors 001 to 112. 17 of them (004, 008, 013, 014, 029, 030, 041, 044, 045, 046, 047, 054, 055, 070, 087, 089 and 090) are historical and observe only. They are kept as classical descriptions to read, not practised, and each points to a door to practise instead.
Every door is a draft awaiting guardian review. The English is a school paraphrase, not a quotation, and each page names its sources.