Thank you for the reply, monkeyboy7706, and thanks for your suggestions on managing the databases. I'm new to server and database administration (and DH), so your help is much appreciated.
Please correct me if I'm understanding this incorrectly:
If I don't need/want to create a new database for each install, I have to at least specify the name of an existing database in the "New Database Name" field. In other words, this field is required for all One Click Installs, and cannot be left blank; either a new or existing database name must be entered for One Click Installs... in which case, the word 'NEW' in that field description is misleading. Right?
I do not need to create a new hostname for each One Click Install - I can leave this field blank, or I can specify an existing hostname if I want. It's not required for One Click Installs. To me it appears like creating a new hostname creates a new subdomain for the specifed domain in the drop-down menu there. Is that right, or does this do something other than create a new subdomain (if at all)?
The username field on this page is for the database ONLY, and if I use an existing database, I can leave this blank, but if I create a database here, I need to specify a username for it. In other words, the new username is only REQUIRED if a new database is created during the One Click Install process.
I do not need to create new separate databases, hostnames, or usernames. The only REQUIRED fields are "Install to" and "New Database Name", and the "New" Database Name can be an existing "old" one if I want.
That's how I'm understanding it so far. Does any of that sound wrong?