You can achieve more or less the same thing
by registering the domain example.com and at the website www.example.com including in it a directory called somethingelse.com
Then you will have a website at http://www.example.com/somethingelse.com/
( ,
Mon 5 Nov 2007, 12:50,
archived)
Then you will have a website at http://www.example.com/somethingelse.com/