I need a lightweight Windows desktop application, written entirely in Python, whose single purpose is drawing on-screen while I teach. The core requirement is free-hand annotation: a transparent canvas that floats above any window, summoned and dismissed with a hot-key. Once active, I should be able to pick a colour, adjust stroke width, draw smoothly with a mouse or tablet, erase strokes, clear the canvas, and hide or close the overlay without leaving artefacts. Please rely on well-supported libraries such as PyQt5, PySide6, or another framework that guarantees fluid drawing performance. Keep external dependencies to a minimum so the finished program runs on Windows 10 and 11 machines that have no prior Python installation. Deliverables • Compiled 64-bit Windows executable (.exe) • Fully commented Python source code • Short README covering setup, keyboard shortcuts, and any third-party licences Acceptance criteria • App starts to the system tray and uses minimal resources • Hot-key toggles a transparent drawing layer over the entire screen • Pen tool draws and erases without lag on an HD monitor • Exiting the overlay restores the screen exactly as it was If you need clarification on colour options, stroke limits, or packaging details, let me know and we’ll lock them down before you start coding.