Printed exactly as supplied, in the order supplied, with no labels and no ranking between them. This site runs no checks against any of them. It publishes no uptime figure, no status light and no date of last checking, because it never looks. An address that opens is not by itself evidence of anything.
The catalogue, page two
The middle of the run. These cards cover what a form receives, what a vendor receives, and the point at which the whole question stops being about networks and becomes about a physical object.
Why half of every card is a negative
A catalogue of exposure that only listed exposure would be useless, and worse than useless, because it would push a reader towards treating every observer as equally informed. They are not. The difference between what a party receives and what a party can conclude is enormous, and most bad reasoning on this subject happens in that gap.
Take the plainest example on this page. A server that renders an order form receives what was typed into it. That is not an opinion, it is how a form works. What that server does not receive is the identity of the person typing, the place they are sitting, or any assurance that the details are true. A reader who knows only the first half will conclude too much. A reader who knows only the second half will conclude too little. The card gives both halves at the same length so neither can be read alone.
The negative half is also the part that ages best. What an observer receives changes when software changes. What an observer structurally cannot receive changes only when the arrangement itself changes, which is rare. A relay in the middle of a circuit has never been in a position to see both ends of it, and no update to anything alters that.
The handover
Somewhere in this stretch of the catalogue, the subject changes. Up to a point everything is about connections, sessions and records held by machines. Then an address gets typed into a box, and from that moment there is a physical object in the world with a destination written on it.
That handover is the most important thing on this site, which is why its card is the longest and the most careful. Everything before it is reversible in the sense that a record can be deleted, an account abandoned, a circuit rebuilt. A parcel that has been posted is in a system that was built to know where things went, and no decision made afterwards reaches back into it.
The remaining cards are on page three, and they move the question inside your own house.
