[Samba] Why does HOMEDRIVE not = H:?

[flinchlock]

I'm running SuSE 9.0 Pro...

Linux mutt 2.4.21-166-default #1 Thu Dec 18 18:23:14 UTC 2003 i686
i686 i386 GNU/Linux
samba-2.2.8a-107
samba-client-2.2.8a-107

XP laptop

When I first setup a Samba PDC, I had this smb.conf:

-----------------------------------------
[global]
	workgroup = NO-CATS
	netbios name = MUTT
	server string = Samba PDC running %v
	encrypt passwords = Yes
	update encrypted = Yes
	passwd program = /usr/bin/passwd %u
	unix password sync = Yes
	log file = /var/log/samba/log.%m
	time server = Yes
	socket options = SO_KEEPALIVE IPTOS_LOWDELAY TCP_NODELAY
	logon script = logon.bat
	logon path = \\%L\%U\.msprofile
	logon drive = H:
	logon home = \\%L\%U\.win_profile\%m
	domain logons = Yes
	os level = 255
	preferred master = Yes
	domain master = Yes
	wins support = Yes
	hosts allow = 127.0.0.1 192.168.1.0/255.255.255.0

[netlogon]
	path = /home/samba/netlogon
	browseable = No

[profiles]
	path = /home/samba/nt_profiles
	read only = No
	create mask = 0600
	directory mask = 0700
	browseable = No

[homes]
	comment = %U's HOME directory
	valid users = %S
	read only = No
	browseable = No
-----------------------------------------

Later, I changed: logon path = \\%L\profiles\%U\%m

When "logon path = \\%L\%U\.msprofile" and I click on "Command
Prompt", I get a command window that says: "H:\"

When "logon path = \\%L\profiles\%U\%m" and I I click on "Command
Prompt", I get a command window that says: "C:\Documents and
Settings\flichlock"

I have compared the XP "set" variables, and I see just three
differences:

< HOMEDRIVE=H:
< HOMEPATH=\
< HOMESHARE=\\mutt\flinchlock
---
> HOMEDRIVE=C:
> HOMEPATH=\Documents and Settings\flinchlock

QUESTION#1: How/what/where/why is there a difference in the results
of click on "Command Prompt"?

QUESTION#2: What EXACLTLY causes the HOMEDRIVE, HOMEPATH, and
HOMESHARE variables?

THANKS