FoxPro JustDrive function   
  The VFP JustDrive() function returns the drive letter from 
  a string containing the full path of a file or a directory.
 
  For example:
 
  JustDrive
  ("C:\Microsoft Visual FoxPro 9\vfp9.exe")
 
  would return the drive letter and colon:
 
  "C:"
 
  Note that JustDrive() does not check 
  whether the drive actually exists, it just processes the string passed
  in as a parameter. The JustDrive()
  function will return the first two characters from the string if 
  the second of these is a colon. If the second character is not a colon 
  then the function will return an empty string. As an example of 
  the problems that this can cause, the use of a valid UNC network path such as:
 
  JustDrive
  ("\\XP_Server\Shipped")
 
  would return the empty string:
 
  ""
 
  We have found that the JustDrive() function 
  is of limited use. The only time that we have found it useful is when an older
  application has had to run on a variety of machines, each of which had the server 
  mapped to a different drive letter.
 
VBA equivalent
  Microsoft Access does not have equivalents to these FoxPro file name 
  commands so I wrote this library 
  
    Visual Basic functions 
  to do give me the same facilities in VBA.
 
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