Generally, there's 4 things that matter: CPU speed, amount of RAM, HDD space/type and audio interface. Everything else is irrelevant.
When it comes to the specifics:
No matter what, he'll need a good audio interface, which has been completely neglected here. He'll need to look into a good Express Card/ PCMCIA Card or whatever type of interface so that he'll be able to render with minimum latency and no clicks or pops. He should research which interface has good performing stable ASIO drivers, as that's the deal breaker. RME is a popular brand, but he'll just have to research. You can have a 3k$ setup and terrible drivers that would render it useless..
He'll need a powerful CPU and a good amount of RAM (which I'll get to), especially if he uses synthesizers. Synthesizers are generated from realtime math rather than prerecorded samples that lay on the HDD.
If he has tons of sample libraries, he'll of course need a large hard drive. SSDs will increase polyphony and if he uses Kontakt, it'll also decrease the memory footprint so he won't have to load as much into the RAM. SSDs aren't necessary, but I highly recommend it if he just wants to hop on and make music without waiting for samples to load. Use HDDs for libraries used less frequently.
The amount of RAM he'll need depends on whether he goes 64-bit or not with the DAW program. It's not uncommon for music producers to stick to the 32-bit version because of plugin compatibility and the plain fact that they don't use over 4gb RAM. Generally, you only need that much RAM if you have a large template or you produce orchestral music. Everything else is relatively lightweight. If he produces orchestral mockups, it's not uncommon to have from 16gb to 64gb RAM. Once again, he must have a 64-bit DAW, but not all plugins are 64-bit compatible so it's just something to keep in mind.
If he's serious about this, he there's a forum dedicated to this stuff with a wealth of information about it:
http://www.vi-control.net/forum
Still, many of the answers aren't just laid out there. The average consumer laptop will probably get the job done, but when your projects become professional-grade, you'll have to really do the research.
As a side note: Mac Book Pros tend to be quite popular among producers when it comes to mobile platforms, it seems. Perhaps he may want to look into one of those.
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