Tile Objects are what they sound like, objects on the tilemap. Most (if not all) objects are actually tile objects since they exist on the tilemap and are saved by it. The page specifies the details of some of the special Tile Objects.
Airlocks are currently simply acting as doors that open when a player gets near and close a few moments later only if a player is not blocking it.
This automatic behavior will be used on some common area airlocks, but secured airlocks should require an interaction to open. Clicking on them with an open hand (if your ID has access and is in your ID slot OR in your PDA which is in your ID slot) or a hand occupied with your ID that has access OR PDA that has ID in it.
Upon opening, green lights illuminate.
Upon opening, red lights illuminate.
When idle (either opened or closed), the lights turn black.
Airlocks make some sound when opening and closing.