SUBST Command Line Utility 

A utility called SUBST is present in Windows NT Workstation 4.0, this enables you access a folder with a drive letter.  For example, if you would like to access a folder using a single letter, you can rely on SUBST. For example if  you have a folder named  "a folder I use a lot".   If you want to access this folder quickly from the command prompt, you could type

 
subst x: "c:\a folder I use a lot" 

and press Enter. Now, you can access the folder by simply typing x: and pressing Enter. Of course, when you use SUBST in this way, your assignment disappears as soon as you close the current window. 

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