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A sheet holds form controls as floating objects of a new kind (ObjKind::Control): buttons that run a macro or one command, and sliders and spin buttons that hold a whole number from 0 to 30000 and write it to a linked cell. They take part in everything other objects do: ids from the workbook sequence, object.move, object.delete and object.setAnchorMode, the Selection Pane and Bring Forward / Send Backward, anchors that follow row and column edits, fresh ids on a copied sheet, and links that follow inserts, deletes, cut-moves, sheet renames and sheet deletes like chart series. Commands (cmd/controls.rs): insert.button, insert.slider, insert.spinButton, control.format, control.assign, control.setValue, control.press and the control.list query. Each numeric rule (0 <= min < max <= 30000, 1 <= step <= max - min, page >= step for sliders) is refused with its own message, and values are clamped and snapped to the step. control.setValue writes the linked cell through cell.set inside one undo group, so dependents recalculate and one Undo restores both; every commit moves linked controls to what their cells hold. control.press runs a button's macro through macro.run, or its command through the macro policy with the document's trust, so a button in a workbook opened from a file asks before it runs anything. Like a macro step, the command runs inside the scripts' file sandbox unless it is an approved file command. Macros never press controls, and macro.rename keeps buttons pointing at the renamed macro. macro.run, macro.check and the debugger take `output`, which replaces the macro's output anchor for that run (a button that sends the output elsewhere). The policy and the approval go by the stored macro; the footprint, the conflict rule and the per-step check work on the cells `output` names. A value that isn't reference text of at most 1,024 characters, or names no cell, is refused before anything runs.