Sharing of files ...

[Sanjay Varma <btserv@xxxxxxxx>]

Hello,

Let me present the problem as an example.

Say there are three guys in an office, Ram, Sam and Nam.
Ram wants to share some of his files or a directory [not all of them] 
with Sam [only]. That is both of them should have read and write
permissions to it. And Nam wants to share some of his files or
a directory with Ram[only].

How could one do this in Linux? Is it possible ?

Thanks in advance,

Sanjay.