Andrus,

It does sound like you'll need to use low level API calls to accomplish this then. I don't really know what ones to point you at, the last time I needed such hardware communication I was writing port access routines in Assembler. Good luck.

>David, I need to control PCU customer display, computer works like
>cash register. I use generic printer driver for this purpose.
>After each keystroke, display needs to be updated.
>Print spooler causes a remarkable delay after keystroke and before
>print output, making its usage impossible.