SHARED FILES

Hello all,

I have a DC with Windows 2003 Server Std. Ed.
There are 20 computers logging on to it in a locally (LAN w/Cisco switch)
and 2 computers logging on through a leased line of 128K connection speed

The DC is hosting all files that the employees work on where they have
access to them through a mapped drive.

The problem is the speed in the remote location of the 2 computers is very
slow, each word or excel file takes ages to open/save.

I right clicked on the mapped drive in one of the 2 remote computers and
chose MAKE AVAILABLE OFFLINE, now all the files have these 2 blue arrows
indicating such.

The question is, how can I make working on these files be always offline
(i.e. as if the files are located locally on the machine) and synchornization
takes place later at night, hence the operation during the day is speeded up.

Thanks and regards.