There are four versions of D 1.6 in the distribution library.  
DA16.COM is designed to use dim video highlighting.  D16LBL.COM 
is a special version that looks for and displays CP/M Plus disk 
labels, instead of ZCPR3 named directories.  D16REV.COM is 
designed to use reverse, instead of dim, video.  D16LBLRV.COM 
does both.