We don't support multiple logins at all.
You have a couple of possibilities here.
1) Make a copy of the default script and have a different URL for read/write and read/only.
First, make a copy of the default.asp script in the PingPlotter Pro www directory and use that for your editable interface. For this example, we'll call it "default_admin.asp" Now, edit your default.asp file to set it to read-only view (you'll see a constant near the beginning for "EDITING_ALLOWED" - set that to false).
Now, your standard view people will get read-only views. We still need to add your read-write page / view, though. The web interface in PingPlotter Pro must have all its pages explicitly defined, so let's go add that.
Go to Edit->Options, Web Server
In the "Served File List", hit "Add".
For HTTP name, enter "/default_admin.asp" (no quotes, but the slash is required).
For local file, enter "default_admin.asp+" (no quotes, the + is required to tell PingPlotter Pro to parse this script).
OK, so now if you access http://(your web server:port)/default_admin.asp, you'll get a read-write web interface.
For more security, you can change "HTTP name" to be more obscure. If you change the "HTTP name" to "admin_editable_tri34a23", then you'll be able to access this page with the URL: http://(your web server:port)/admin_editable_tri34a23 - you can change it occasionally if you think someone's doing something they shouldn't. Note that it doesn't need to have an .asp extension - you can use anything you like.
2) Use IIS and edit the default.asp to check for a user name. You'll need to do something like this:
if Request.Servervariables("LOGON_USER") = "adminusername" then
Const EDITING_ALLOWED = True
Const EDITING_ALLOWED = False
Of course, you'll need to set up IIS security at that point, which is beyond the scope of this discussion.
Please let us know if either of these solves your problem!