Can we daisy-chain computers together in Ethernet?


Let's say we have four computers that we want to network together. Of
course, we can get a four-port hub and run an Ethernet cable from each
individual computer to the hub.

I wonder, though, if it's possible to use some sort of RJ45 splitter
in order to daisy-chain the computers in a bus topology? For instance:

Computer A has an Ethernet cable connected into it which leads to
Computer B, but before the cable goes into Computer B, it goes through
a Y-splitter, one side of it going to Computer B, and the other side
leading on to Computer C. Similarly with Computer C, it has a Y
splitter which leads to Computer D.

Can this be done with one of these?:
http://cgi.ebay.ie/Cat5-Network-Ethernet-Adaptor-Converter-RJ45-Splitter_W0QQitemZ140218666290QQihZ004QQcategoryZ101282QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

I get the idea that this little cheap device can't be used... but I'd
appreciate if somebody couple please explain why to me.

Another scenario:
Let's say you're in a college or a library and there's a workstation
hooked up to an Ethernet socket in the wall. You want to join the
network without having to disconnect the workstation, so you use some
sort of Y-splitter that you plug into the wall.

Again, is this possible?
.

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