druck wrote:
> If you measure between 2 pins and get 0V it /could/ mean they are at the
> same potential, or it could mean there is *NO* connection between them.

There IS a connection between them. The voltmeter may (should) have a
high resistance but not an infinite one. So any open pin will be pulled
to the level of a live one. A non-open pin may well (and should) be able
to source or sink the very small current throught the voltmeter and
still impose its own potential.

The measurement as stated is valid and sensible.

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