>the only time you would need a separate neutral for each GFI is if they are all feeding from separate circuits?
That is correct. But that is because separate circuits need their own (line-side) neutrals by Code. This is not a technical requirement for a GFCI to operate.
However, the load side current must not be diverted anywhere. In other words, if you cross your load-side neutral with any other neutral, the GFCI will trip. And if any load on the GFCI is not hooked to the load-side neutral of that same GFCI, then when that load is activated, the GFCI will trip.
[This message has been edited by Dspark (edited 07-10-2001).]