hello
i have a lan in my OFFICE ,all PCs in this NETWORK use same OS(xp sp2),i have a PC in home with same OS too.
i want that my PC in home join with my lan in office by using phone line.
how i can do it
please guide me.
So you want to create a VPN or a domain?
If it is a normal workgroup then all the settings will have to change but I guess it is a domain witch can use VPN connection.
You can simply go to start -> CONNECT to -> show all network connections -> file -> new connection -> next -> set up connection manually-> fill EVERYTHING in.

For a normal company LAN (Local Area Network) this will work but it could be that the company network doesn't support VPN. When the company doesn't use a domain.
Try this and let us know.

Jonas hi
i dont use any domain in my LAN and i dont want create a domain. it is a normal LAN with a normal workstation and it dont use internet .this LAN is in my office,in this workgroup ,i have 2 PCs.
and i have a third PC in my home.i want to connect PC(home) to LAN by phone line that this PC will become a member of this LAN like others 2 PCs.
thank you

I am SORRY to say that this is not how networking works.

Your home computer would need a way to authenticate to the work LAN. This is normally done with a domain controller which means you have to setup a domain at work.