iterami/Docs.htm/common HTM Repos/core.js/core_handle_keydown(event)

• Updates the state of "core_key_shift".
• Does not call event todo if the control, alt, or meta keys are down, or if the pressed key is already down.
• Does not call event todo if the menu is open and blocking events, except for the "Escape" key.
• Calls "keydown" event todo().