Just to add to this, regarding Search; yes, one can go through Charms & using his example begin typing N-O... once you then click on Notepad, it appears back on Desktop. But, it is, also, not necessary or the only way, to go via Charms... WinQ (all Applications), WinW (Settings) & WinF (Files)...
applications
charms
desktop
file management
keyboard shortcuts
navigation
non-touch
notepad
quick access
retro-fits
search
settings
start menu
support
system flow
third party
tips
touch pcs
user experience
windows 8