AltSnap is a native Windows desktop utility that lets users move, resize, and manage windows by holding Alt and dragging with the mouse. In production it runs as a tray application and loads a companion hooks.dll into its own process; that DLL installs low-level keyboard and mouse hooks, detects Alt+click/drag gestures, and manipulates window placement through Win32 APIs. It also implements Aero-style snapping, configurable snap layouts/zones, blacklists, global hotkeys, MDI handling, a large action system assignable to mouse buttons/titlebar clicks, and an optional elevation path. The project deliberately avoids DLL injection into other processes; instead, input is captured via WH_KEYBOARD_LL/WH_MOUSE_LL and heavy window movement is offloaded to a worker thread to keep the hooks responsive.