Click palette to add · drag header to move · ✕ deletes · dots wire one terminal · PORT NAME → port auto-connects · SHIFT+drag = lasso · ⧉/Ctrl+D = clone · ⊕ on a wired reader adds its door devices (auto-located & wired); choose which via Edit · ⤡ collapses the device's location, dbl-click node expands · wheel = zoom · Del = delete