I don't know if it is good practice or not, nor am I an expert, but I
have 3 16F877 running on one 16MHz xtal, without problem. This is a
one-off prototype, not intended for mass production.

I use CLKOUT pin of one PIC to feed CLKIN of another.

> Is multiple micros on one clock poor design practice, or can I
> expect more capability than 2, or is reality somewhere betwixt?

> As I said, I will do some more of my own homework, but as a guy
> that wasn't even aware of PIC's w/ LCD drivers, I though it wise to
> ask the experts...

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