Write to keyboard needed

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http://www.linuxquestions.org – Hi, I'm using a microcontroller between my keyboard and PC to reduce repetitive typing and do a bit of filtering. I know it can be done in software, but then it has to be re-done on every machine I use. Hardware is transportable. It would be really helpful if I could write text to the keyboard so I could record existing text. Is there a keyboard driver that allows this, or do I have to try to modify one? Thanks Jim (HowTos)