I think there are some misconceptions about wards floating around. Considering that wards are often the most basic defense of corporations against magic, I've decided to start a discussion about just what shape wards take and what effect they have on the defense of a corporate instillation.
Now, the most basic misconception about wards I've seen is that they are capable of making barriers across empty space. This is blatantly untrue, a ward has to be anchored on a physical object, such as a wall, door, or window. The idea that a dual-natured being has to seriously worry about being forced through a ward while going up an elevator shaft is ridiculous. Unless a corporation has prepared a sustained Mana Barrier spell in their elevator shafts, all of their elevator shafts requiring a huge investment of time, money, karma (for sustaining foci) or concentration (for sustained spells), a dual-natured being has nothing to worry about from casual Mana Barriers in their daily life.
Another misconception I've seen is that Astral Forms have the ability to manipulate their forms, gaining the ability to slip under doors or through the cracks of windows, by-passing wards. I have seen nothing to indicate this. An astralling projecting magician should take up the same volume on the astral plane as he does on the physical plane, having the same restrictions about squeezing through a mesh screen as any normal person if that screen has been warded.
Wards also don't simply act as a wall around their center. Wards affect an area, affecting all objects that are within the warded area at the time of its creation. Because the ward's focal point cannot be moved in relation to a ward, obects like vases, desks, cubicle walls, and other objects that move frequently from their positions cannot be warded. Windows and doors, which don't move from their position but move in general, may be able to be warded, but I'd like the community's opinion on that point. Everything else in a warded building, walls, floors, ceilings, and sealed windows all become astral barriers and prevent astral movement, meaning that a spirit that manages to penetrate the first wall of a ward still doesn't have freedom of movement throughout the building.
The primary purpose of a ward is to stop astral beings from having free reign over a building, as well as prevent divinations and other detection spells. Besides this, they do not pose any danger to anything and are wholly defensive in nature.
I don't know whether this is all neccesarily the way wards function, this is the way I interpet them. If anyone has a different idea about wards then please, discuss them here.