nstore - shows you all objects in your inventory with the flag.
nstore <item> - toggles the ability to store the item in a container.
nstore <+/-> - Adds or removes the flag from all objects in inventory.
This command lets you mark items in your inventory so that you are not
able to store them.
This command is a toggle; using it on an item that is already marked will
cause that item to be unmarked--unless the item loaded that way, in which
case it is permanent.
Using the command with no arguments will list your inventory with all
items which are marked indicated by a +.