This tweak will rename "My Computer" to "Username on Computername" making it simple to determine which computer you are logged on to and which username you are logged on as.

Using REGEDT32.EXE (this is necessary for REG_EXPAND_SZ) open your registry and find the key in the settings section below. Then continue following the steps for your Windows version.

For Windows NT
Delete the existing value called "No Name" and add a new REG_EXPAND_SZ value with an empty value name and set the value to "%USERNAME% on %COMPUTERNAME%".

For Windows 2000
Rename the value named "LocalizedString" to "LocalizedString.old". Create a new REG_EXPAND_SZ value named "LocalizedString", and copy the contents of the original value to the new value except change the words "My Computer" to equal "%USERNAME% on %COMPUTERNAME%". For example, the new "LocalizedString" value may equal "@C:\WINNT\system32\shell32.dll,-9216@10