Installing same set of packages on more then one machine?

["Charlie Grosvenor" <charliemail@cgrosvenor.co.uk>]

Hi
	Is there anyway of extracting the list of packages installed on
a machine in a format that you can then easily go and install all the
packages on another machine? If it is possible to extract the list how
can I get the other machine to install the packages on the list?

Thank you

Charlie

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