Bill, I think I'm back from my ACID Trip now 
After some further testing I have to rescind my previous statement about your being correct.
1.
For Windows NT yes the SUBST does work.
2.
For Windows 2000 - NET USE \\anyserver\anypath will map root there.
3.
For Windows 9x - It MUST be shared to get ROOT mapping
i.e. on a Windows 9x
C:\>net use p: /home
Drive p: is now connected to \\sm-cag-fp03\users Your home directory is
p:\fmlast.
p:
p:\users
cd fmlast
p:\fmlast
This is what you get when this is in User Manager:
\\sm-cag-fp03\users\fmlast
The %username% is used for creating or editing multiple entries in User Manager
it does not map a Windows NT or 9X system to this folder unless it is shared.
USING \\SM-CAG-FP03\USERS\%USERNAME% while these three users are selected in User Manager
will give you the follwing results.
FMLAST1
FMLAST2
FMLAST3
\\SM-CAG-FP03\USERS\FMLAST1
\\SM-CAG-FP03\USERS\FMLAST2
\\SM-CAG-FP03\USERS\FMLAST3
But only a Windows 2000 will map directly there without Sharing FMLAST1 FMLAST2 & FMLAST3
Omegawolf,
Yes you can do \\SERVER\USERS\ACCOUNTING\THIRD_ROW\LEFT_SIDE\CUBE_TWO\BSMITH
For it to work you need to do this:
Windows 2000 = No entry needed if placed in User Manager as \\SERVER\USERS\ACCOUNTING\THIRD_ROW\LEFT_SIDE\CUBE_TWO\BSMITH
Windows NT 4.0 = SUBST H: \\SERVER\USERS\ACCOUNTING\THIRD_ROW\LEFT_SIDE\CUBE_TWO\BSMITH
Windows 9x = Will not work you must SHARE BSMITH as either BSMITH or BSMITH$ (or a name of your choosing), but
it must be shared. Otherwise if you only shared CUBE_TWO and used
NET USE H: \\SERVER\CUBE_TWO\BSMITH When you map you will be in CUBE_TWO and need to change directory to BSMITH
So, unless your working Magic Bill -- I have tested this till I'm blue in the face and I can Not get it to map as you say.
[ 26 August 2001: Message edited by: NTDOC ]