For the Microsoft Windows power user

I've been using Windows for approximately 20 years and consider myself a power user who knows most of the keyboard shortcuts, who can do things quickly and efficiently in this operating system, and who can fix most problems.  But there's always somethings new to learn ...

net user command

This command provides some very useful information about your account or someone else's.  I've left out the specific details for security's sake.

C:\>net user /domain
The request will be processed at a domain controller for domain .

User name                   
Full Name                   
Comment                     
User's comment
Country code                
Account active              
Account expires             

Password last set           
Password expires            
Password changeable         
Password required           
User may change password    

Workstations allowed        
Logon script                
User profile                
Home directory
Last logon                  

Logon hours allowed         

Local Group Memberships
Global Group memberships    
                            
The command completed successfully.

where command

Similar to the "which" UNIX command.  May not be available in Windows XP, but at least is available in Windows 8.1.  Reports location of executable that will be used according to PATH environment variable:

...>where java
C:\Windows\System32\java.exe 
 

Power user software

HxD 

If you need a user-friendly and accurate hex editor for Windows, HxD is your best bet.