telnet help

Well i have windows 2000 professional installed in 20 computer of my office and well i have my computer as server
Well what i want to know is Is it possible to access unshared data ,files,folder of network(for security reasons) from other computer in network.I mean the folder which has not been shared but is in may be one of computer of LAN
is it possible
AND othet things is is ther any any password cracker program (like amibois) because of which other may use my password
This is just for info.
I would be very grateful for info.
saharika

If you have the username and password of an Administrator of the machine (and in Windows 2000, that can even be a blank password), you can do just about anything remotely. Make sure strong passwords are in use.