Chapter 2 (f) - If you receive an error when using Loadhigh with a
                           Third-Party Shell. 
 
The MS-DOS 6 loadhigh command supports the switches /l and /s, which are used primarily by 
MemMaker. For example, the following MS-DOS 6 loadhigh command includes the /l switch:
  
loadhigh /l:0;1 mouse.com
  
Third-party command interpreters, such as 4DOS and NDOS, are designed to replace COMMAND.COM
(These command interpreters are sometimes called shells). These command interpreters must be 
updated in order to work correctly with these new loadhigh switches. If you use the /l or /s parameters
 with NDOS or 4DOS, you will receive the following error message:
  
Error: Unknown Command "/l:<region1>;<region2>
  
To work around the problem, either use COMMAND.COM for your command interpreter or remove the /l 
and /s parameters from your loadhigh (lh) commands.
For more information, or to obtain an update of your third-party command interpreter, contact your 
command interpreter vendor.

 