[Draggor]

I discovered this with my cleric. If you right click on yourself the only spells that are available are ones you can cast on yourself, cure etc. To cast a summoning spell for instance put the mouse pointer at an empty spot and right click. Now you can cast a spell that doesn't require a target. To cast spells on allies right click on them. Basically when you right click is when you select the target or target area of the spell.