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| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#21
May 22nd 10, 03:41 AM
posted to uk.transport.london,misc.transport.urban-transit,uk.railway
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ELL: poor passenger information systems
On Fri, 21 May 2010 12:45:01 +0100, Ivor The Engine
wrote: On Thu, 20 May 2010 16:45:56 -0700, Nobody wrote: Lesson No. 1: posts to Usenet CANNOT be deleted. But they can be cancelled if the news server permits, so not everyone gets to read the original. You'd hafta be VERY FAST. |
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#22
May 22nd 10, 03:56 AM
posted to uk.transport.london,misc.transport.urban-transit,uk.railway
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ELL: poor passenger information systems
On Fri, 21 May 2010 20:41:56 -0700, Nobody wrote:
On Fri, 21 May 2010 12:45:01 +0100, Ivor The Engine wrote: On Thu, 20 May 2010 16:45:56 -0700, Nobody wrote: Lesson No. 1: posts to Usenet CANNOT be deleted. But they can be cancelled if the news server permits, so not everyone gets to read the original. You'd hafta be VERY FAST. My response to that above was posted in nano-seconds... Er, you might THINK you're deleting a posted Usenet message to The Whole Wide World, but in effect, all you're doing is removing that posting from "your own news reader", that is, on your own PC. IF (take note of the command), you unsubscribe from the ... (news group de jour) and then RE-SUBSCRIBE/RE-JOIN, you'll quickly discover that any supposed "deleted" messages are, flipping heck, still there and the world is looking at them. Absolutely, positively guaranteed. |
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#23
May 22nd 10, 11:27 AM
posted to uk.transport.london,misc.transport.urban-transit,uk.railway
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ELL: poor passenger information systems
On Fri, 21 May 2010 20:56:36 -0700, Nobody wrote:
But they can be cancelled if the news server permits, so not everyone gets to read the original. You'd hafta be VERY FAST. My response to that above was posted in nano-seconds... Er, you might THINK you're deleting a posted Usenet message to The Whole Wide World, but in effect, all you're doing is removing that posting from "your own news reader", that is, on your own PC. IF (take note of the command), you unsubscribe from the ... (news group de jour) and then RE-SUBSCRIBE/RE-JOIN, you'll quickly discover that any supposed "deleted" messages are, flipping heck, still there and the world is looking at them. Absolutely, positively guaranteed. Thank you for your expert advice. Now read what I said. I never said messages can be deleted. The Cancel protocol has been a feature of Usenet from early days. Because of abuse, not all news servers honour requests so messages can be left on servers. Some news servers do cancel messages, so my comment "not everyone gets to read the original" stands. RFC1036: 3.1. Cancel cancel Message-ID If a message with the given Message-ID is present on the local system, the message is cancelled. This mechanism allows a user to cancel a message after the message has been distributed over the network. YATPICMFP? |
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