I don't think NTL offers 128kBps connections any more. They upgraded their 512K customers to the 2Mbps package. Are you sure your friend has not been upgraded by NTL?
If he was using a DOCSIS hack to increase the speed setting of the cable modem he would almost certainly have been disconnected within an hour.
There are some web accelerator programs that work by directing your web traffic through a server on a fast line that compresses the webpages before sending them to you and may send a low-res version of an image first so the page seems to load quick. Such services can be good on dialup but they only speed up webpages, they don't speed up downloading of uncompressable files like mp3's, zip's and rar's.
There are also some scam programs that do nothing and just display a bargraph or somthing claiming to have speeded up the connection and ask for a credit card to register after your seven day trial.
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