Debug

Debug = nnnn (0):  Controls certain debugging options which can assist you 
in tracking down unusual problems.  Use the following values for Debug; to 
select more than one option, add the values together: 

    1   During the startup process, display the complete command tail 
        passed to CMD.EXE, then wait for a keystroke. 

    2   Include the product name with each error message displayed by 
        CMD.EXE.  This may be useful if you are unsure of the origin of a 
        particular error message. 
 

 Also see the batch file debugger, a separate and unrelated facility for 
 stepping through batch files.