First, flying Autumn
It is worth noting that the same network segment cannot be accessed should set the port consistency and disarm the firewall.
Second, file sharing
Win7 and XP right-click the "Share" option, you can set access to "Everyone" or add an account.
If you are unable to access the situation, you can try to resolve (refer to http://www.cnblogs.com/cm186man/archive/2008/03/05/1091346.html) by following the methods below.
1. Enable the Guest account, or you can set a password for guest.
2. Run "gpedit.msc" or locate "local policy" from the control Panel and remove "User rights Assignment" to "Deny access to this computer from the network".
3. Change the network access mode, XP by default is to log all users from the network to the Guest account processing, open the Group Policy Editor, select "Computer Configuration →windows settings → security settings → Local policies → security options", double-click the "Network access: local account sharing and security mode" policy, The default setting is guest only-local users authenticate as guest, and change to classic: Local users authenticate as themselves.
Third, Remote Desktop
Remote Desktop is a magical thing, basically can ping through, you can transfer files.
Windows LAN sharing