Not formatting, rather Disk Clean & Disk Defragment needs to be done as maintenance every 3 months depending upon what you do on it.
just by formatting the computer with the language
first you need a router and internet access, your laptop should detect the network
yes you can first you should install the driver through CD and then connect the laptop with printer.
You'll have to charge it through your computer or laptop, you should have a cable which will connect you to it.
the boss should get a laptop and the cleaner shouldn't.
Yes, generally; the question isn't what the hardware is, the question is what OS the machine uses. If it runs Windows, a laptop isn't much different than a desktop machine.
several hundred dollars
A laptop
I do not know where you are traveling to...but, in all of my international travels, I have taken my laptop. All I have been asked to do was take the laptop out of the case, power it up....once powered up, I was asked to take out the battery so that they can scan each piece separately I have NEVER had them go through my programs or files.
through wireless modem
You should get a laptop bag that is comfortable for you and is easy to open. If you go through security an average of three times, you should get a bag that is fairly easy to open. Also you probably should not get anything bulky
If after formatting your going to install WINDOWS XP or an older version then when you run the installer the installer will automatically format the HDD.