what is this window?

[Sciencetechnologies]

small window on my desktop called network manager applet

Can't delete it or close it ?

what is this?

[Tesla Trooper]

do you remember from windows that little icon with 2 flashing monitors that indicates you are connected..?
this is just like it..

[konqueror7]

what do you mean by small window? or is it a tray icon, if its a tray icon its pretty normal,,,but if you want to remove it, you must manually remove it from apt-get or synaptic...

[duds2008]

Can you send a screenshot?

[Kevbert]

Welcome to Ubuntu.
I would keep it as it tells you the state of your network connections - wireless or wired (internet).

[aiser]

:)