Q: what can this 1 GB 667 mh computer do?

You're probably going to have to offer more info than that.....1GB 667mHz doesn't give us much to go on.

You could further identify the unit by several means, and then additional build series

specifications relating to that unit model year could be researched or found elsewhere.

• How to identify MacBook models - Apple Support

The first edition MacBook 13-inch coreduo 1.83GHz model uses the same memory chip

as you referenced above, and mine was able to upgrade to a total of 2GB in two slots,

it is fairly easy for a user to add or change the total of RAM available to the system.

There are repair guides from iFixit.com site that may be of help to update hardware

and to understand the model you have, its place, in the original MacBook series:

https://www.ifixit.com/Device/MacBook

As there are pages of information, one section in particular as it applies to MacBook

from the everymac.com technical specs for MacBook (early series 2006-2010) here:

•Apple MacBook Specs - All MacBook Technical Specs - (note early model versions)

http://www.everymac.com/systems/apple/macbook/index-macbook.html

And the first edition (as mine) can run only as new an OS X system as Snow Leopard

10.6.8 given the hardware limitations of that vintage, as a 'coreduo' Intel-based model

whereas the 'core2duo' Intel series of higher specs can run later OS X versions, but

they all will require at least Snow Leopard 10.6.8 before you could access the online

App Store from the computer, to research what (if anything) you may want to run in it.

To purchase the upgrade to Snow Leopard, a retail DVD is still available from Apple Store

and the cost is about $20. then the update to that is a download from Apple servers.

•Mac OS X 10.6 Snow Leopard - Apple: (retail purchase - upgrade DVD)

http://www.apple.com/shop/product/MC573Z/A/mac-os-x-106-snow-leopard

After purchase and install of the above OS X 10.6 full new system (upgrade) from DVD

a download file to update that to the last step of Snow Leopard may be installed to finish

•Mac OS X 10.6.8 Update Combo v1.1 download final step for Snow Leopard installation:

Mac OS X 10.6.8 Update Combo v1.1

Depending on the computer itself, other limits and software types may be available, such

as later versions of vintage iLife, iWorks, and other Apple + third-party software titles.

The early models are probably best left at Snow Leopard 10.6.8, and with 'rosetta' installed

from the Snow Leopard 10.6.3 retail DVD; it does not use much resources & works well.

And with the first-edition MacBook 13-inch 1.83GHz core-duo, I recommend 2GB RAM

plus a faster spin-rate hard drive to replace the 5400-RPM; mine's 7200-RPM & runs well.

In any event...

Good luck & happy computing!

The window which opens when you activate "About This Mac" shows much more than

the single line telling about the memory chip capacity. You can click on the information

just beneath the main title inside that small window, to see the OS X version, the build

series of the system, and the product serial number. Click on words in line beneath OS X...

See this example from one of my Macs:

Also, you can click on "More Info" to launch a utility that will show almost everything in

the computer, both hardware and software, in more details than you may know what

to do with; so you could learn quite a bit about your computer.

It may also be some other model, instead of an original MacBook (2006 to 2010) since

the MacBook Air early model also used a similar memory chip type by specification.

So that one item you relate to "... 1GB 667 MHz..." could be one of several products.

(Yet an early MacBook/Air model likely shipped with more than 1GB RAM.)

However by using the links I posted previously, you can or should be able to find a ton

of information on almost any Apple computer including all portable models, online.

Hopefully you can help the friend find useful purpose for that older Mac portable.