Documents directory writeability

[AchterSlot]

Does anyone know if it is possible for an application (preferably an iTunes plugin) to write to an iPhone apps Documents-directory?

If it is possible, any information you can provide on how to accomplish this in an iTunes plugin would be very much appreciated.

Thanks for any information about this.

[AchterSlot]

Just to clarify a bit more:

Is there a way to write files to this directory remotely? I'm hoping it's possible to do via iTunes or whenever the iPhone is connected to a Mac/PC via USB. Could this be done with an iTunes plugin? If all else fails, is there an easy way to setup a WebDAV server on the iPhone?

Thanks.