ClearKeyMap

ClearKeyMap:  Clears all current key mappings. ClearKeyMap is a special 
directive which has no value or "=" after it.  Use ClearKeyMap to make one 
of the keys in the default map (Tab, Shift-Tab, Ctrl-Tab, or Ctrl-Bksp) 
available for a keystroke alias, or in the [Secondary] section of the .INI 
file to clear key mappings inherited from the primary shell.  ClearKeyMap 
should appear before any key mapping directives.  If you want to clear 
some but not all of the default mappings, use ClearKeyMap, then recreate 
the mappings you want to retain (e.g., with "NextFile=Tab", etc.). 

If you set DescriptionName = EA, CMD.EXE will use the ".SUBJECT" extended 
attribute (EA) for file descriptions instead of a separate file.  Note 
that using EAs will slow the DIR and SELECT commands noticeably.  On a FAT 
volume, performance may be 10% to 200% slower, depending on whether the 
system has cached the extended attributes.