All you need to get started is a 2 gig pendrive that's laying
around.   Here is the reason to do it.  You have higher internet
security when it comes to browsing, online banking, onlline
shopping, and online bill pay.   Plus it is your personal
'computer' that you can plug into any computer capable of usb
booting.    My case for example:  I have an employer provided
laptop, which is managed by a remote IT dept, which I take home
at night to do various research and reading for my employer as
well as regular usage during working hours.  My employer states
they would like the laptop to be business use only if possible
and to limit personal usage.   So do I really want to open
emails in my personal account or check my bank account on it
especially when it is monitored remotely??  The solution is a
pendrive computer.   It boots the laptop, creates a ram-disk in
the computer's ram that loads and runs the operating system on
the pendrive.  It does not use the computer's hard drive and
since it operates entirely in r