The DCL program SET DEFAULT has two problems with nested logical
names: 


 1.) If the first translation has a trailing colon and there is no
explicit directory-spec in the second translation, SYS$DISK is changed
to the 1st translation and the directory portion is not changed. The
"actual" current directory remains hidden in SYS$DISK. 

 2.) If the 1st translation has no trailing colon, then only the
directory portion of the default is changed! This can leave SYS$DISK
incorrect thereby leaving the default incorrect. 


In certain circumstances, SET DEFAULT returns an error but still
changes your process to a bad default. 


TO.COM fixes all of the above problems and does much more. See the
other .TXT files for additional information. 
