reverse USB driver - is it possible?

[Wojciech Puchar]

>
> When USB was designed, they didn't think about what is called cross-over in
> the ethernet world. Therefore hardware is typically limited to host or device.
> Hardware that can do both is called OTG USB hardware.
>
OK fine, i now understand exactly what "OTG" means in eg. microchip 
microcontrollers. So this few $ things can do this, and expensive PC 
cannot.

So the only way to do this is to make a microcontroller based bridge or 
there are such solutions already available?

actually the only thing i want is CD/DVD USB simulator using file on my 
laptop or even separate flash memory (pendrive).