David:
I will assume that "explicit choosability" as it were, is based upon an
account's presence on the welcome screen. For example, if your PC has an
account named "David Cook" you have a pretty little icon on the welcome
screen. Clicking the icon logs you on, provided you supply a password if
necessary.
You can add the Administrator account to the Welcome screen, so that it
appears alongside additional accounts that you have created. You can also
assign a pretty little icon to that account.
Here's how (I'll also explain how to hide an account, and why).
1. Learn how to use regedit.
2. Run regedit.
3. Navigate to following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\Winlogon\SpecialAccounts\UserList
Depending on the configuration of your system, there may be 1 or more
accounts already listed. Ignore most of these.
There's a theme to the values in here.
They are all DWORD values.
The name of the DWORD value corresponds to the selected account.
The data values you are concerned with:
Data value of 1: Account is visible on Welcome Screen
Data value of 0: Account is not visible on Welcome Screen
The administrator account is not in here by default.
So, right-click and choose New->Dword Value.
Type administrator and hit enter.
Highlight the administrator value and hit enter.
Give it a value of 1.
Reboot and Administrator is now available on your welcome screen.
Conversely, say you have an account called "Super Secret Account." You want
to remove it from the welcome screen.
Follow the same process as above, only give the "Super Secret Account" a
data value of 0. Reboot (or well just log off or switch user) and now "Super
Secret Account" is no longer accessible from the Welcome screen.
Reason for removing it. You have a computer workgroup. Each computer has
an individual user, with usernames like Steve, Bill, and Jane. That's what
each person wants to login as. But, you want to ensure file sharing is
successful. So you create duplicate accounts on each PC in the workgroup and
set the proper password for each. But, you don't want Steve's computer to
present the ability to login with the Bill/Jane accounts. You edit the
registry, adding values with the names Bill and Jane, then set the data
values to zero. Now you have successful file sharing, and you don't have an
overwhelming Welcome Screen.
Hope this helps.
Joe