QTR-Quadtone RIP

I couldn't find an appropriate answer to my question via Google...

I own an Epson Stylus Photo 2100. When I do a printhead alignment, 
where is the data stored (I use WinXP)? Somewhere in the Registry or 
in one of the driver's files? Does the printer store the values in 
some kind of NVRAM or flash?

I'm just a bit curious because AFAIR when you update the printer 
driver, you're advised to deinstall the old one. Does this 
deinstallation lead to a loss of a previously applied printhead 
alignment?

What about two or more OSes sharing the same printer. Do I have to 
perform a printhead alignment in every single OS (all of the same 
type)?


\relax\bye %  Horst