The .xxx commands actually only work on private servers.. GM's have a tool (Works like an addon and is called "GMTool" ) which allows them to do most of the stuff they do, but they can also use the console to command their actions.
What actions a GM can take, is limited based on the type of GM account they have.. Meaning that a standard GM, working in the callcentre with all the others (usually there's about 100-200 GM's for all the EU realms at one time), can do almost nothing, and must ask a senior GM to do stuff. Senior GM's have the power to create items (Using /console commands), give spells etc etc..