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Thanks Mike. I'm using the 16F1823.

Yes there was always a resistor. Thank you for the lesson.

Also, when you say 'L.E.D.s aren't meant to be driven by a low impedance voltage source; isn't when a circuit using an L.E.D. for a power indicator (which I've seen) driven by a regulators output (to...

I thought the resistor only provided current limiting? Maybe you've explained but I don't get how it drops the voltage. I've used voltage dividers using 2 resistors, etc.
Thanks for your patience.

I've thought of this for a while and it has come up I need to know how it applies to a usage:
In the PBP Manual, there is a simple blinking of an L.E.D. test in one of the commands as an example....