Compatibility: 2.0+
Purpose: Sets the limit for drive IDs usable by the Subst command and for
use as InterLink drives.



d is a single alphabetical letter in the range A to Z.

  TECH Notes  

  DOS maintains an undocumented internal array of information on each
drive, including the ASCIIZ name of the current directory.  The size of
this array is set via the LASTDRIVE= command.

The undocumented DOS fn 52H (get DOS Vars) returns the address of a
DOS Variables Block, one field of which contains the LASTDRIVE= setting
and another field points to a pointer to the drive info array.

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