windows logon

i have 2 computers on my home network that uses a linksys router. I was playing around and a question occurred to m, if there are two computers, and I don't know the password for one to get onto it, can I brute force it? are there any easy ways to crack the password? any software that would help? usually when I try, a logon for user name and password pops up. Basically, I am looking for any and all ways I can get on my second comp from my first, besides of course shared folders and remote connection. thanks

Given enough time you can bruteforce ANY password. Use Google to find the software you want.