Containers are objects that allow you to store other objects inside them. Openable containers have a separate lock to determine if a player may open them. Containers have a large number of messages which get printed when players act upon them.
Openable containers have opacity.
The first two forms pick up the named object and place it in your inventory. Sometimes the owner of the object won't allow it to be picked up for some reason. As before, sometimes the owner of an object will not allow you to do this. Printed in place of the contents list when the container is empty. Printed to the player and the room when an object is successfully placed in a container.