export and setenv

export

export is used to change system devices (output stream, terminal type etc.)
The syntax is: export DEVICE=type
Example: Logged-in from another machine you'd like to use the graphics output.
You'll use: export DISPLAY=newaddress:0.0

To check device settings use : echo

setenv

setenv has a similar function like export.
The main change is the syntax:
Instead of export DEVICE=tralala
you'll use setenv DEVICE tralala.