management mode??
do you mean you installed ADNM (AMS) on a server and installed a managed client on the laptops?
if so:
1) this is the wrong section, your supposed to post this in the avast! Distributed Network Manager section.

2) search would have been your biggest friend, this question has been answered several times already

dispite, its sometimes hard to cook up the right search words so i will be nice to you....
Avast clients that are installed with the managed client (via ADNM, i assume you mean this with managed mode) will try to contact the local AMS server. When this servers is unresponsive the managed client will automaticly turn to the internet servers from Alwil themselfs....
So while your laptops are out side the office the laptops will update correctly
right now im at a laptop from work which hasnt been in the office or contacted the office for 5 days now and i do have the latest updates running on my managed client

for checking which versions you have:
right click on the avast icon in your icon tray and click the about avast option, there you will see which date and version the definitions have.
on the website you can check which version is the current....