How to access other computer using different name/password

Once you have successfully accessed another computer in the same LAN, the user name and password will be remembered by your computer, if you access the same computer again, the computer will use the defalt username/password to access. what shall we do if we want to use another username/password. Here is the brief answer below.
First open the DOS interface, by input 'cmd' in the 'run'. using 'net use' command to see what's current connection, is as below:

>net use
会记录新的网络连接.
状态       本地        远程                      网络
-------------------------------------------------------------------------------
OK                     //192.168.0.138/IPC$      Microsoft Windows Network
命令成功完成。

Second delete current connection.

>net use //192.168.0.138/IPC$ /delete
//192.168.0.138/IPC$ 已经删除。

Third access the server by IP, the connection interface will prompt out asking you to input the user name/password.

i tried this on my own computer, it works, but on some of my colleagues' computer didn't work, i don't know the reason.