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   SETDRV( <expC> )

       Purpose

   Change system's default drive.

       Parameters

   <expC> is letter of the new drive.

       Return Value

   .T. if drive is successfully changed, .F. if the operation fails.

       Comments

   SETDRV() allows changing drives without having to use a RUN 
   statement. SETDRV() requires that the drive letter be in uppercase.
 
       Example

   .
   .
   .
   newdrive = 'A'
   if SETDRV( newdrive )
       ? 'drive changed' 
   else
       ? couldn't change drives 
   endif
   .
   .
   .