WordPress MU

ON the "Edit Blog" page, I see Domain and Path listed as properties under Blog Info. Below, I see SiteURL listed under Blog Options. I'm trying to comprehend fully the difference between these 2 settings. Here's what I have so far:

1. Under Blog Info, the Domain and Path, concatenated, form the URL that points to the blog. If the WPMU installation uses subdomains, then this is the pseudosubdomain for the blog; if the installation uses directories, then this is the pseudopath. (We use subdirectories, it may be that the Path setting is not present when subdomains are used. ??)

By "pseudosubdomain" and "pseudopath", I mean that WPMU does not actually create a subdomain or directory. Rather, the software simply uses these to enable users to get to their respective blogs.

Also, I notice that

a. "http://" is hard-coded into the Domain setting, and

b. the string specified in the Domain setting is hard-coded into the Blog Address in Add Blog.

2. Under Blog Options, the SiteURL setting allows me to enter a full path pointing to the location where WPMU itself is installed. As far as I can tell, I can specify http or https, as appropriate. I imagine this setting is entered by the installer at install time.

I have the impression that the Domain setting, above, is taken directly from the path entered in the SiteURL setting here.

So my first question is, am I on track so far? Are there any corrections or additions to the foregoing?

If "yes", then my second question(s) is this: Why are these settings, well, settable. I mean, isn't the path to the install directory sort of set in stone? Under what conditions might one choose to change either or both of these settings?

I have a feeling that I have one or two more questions, I'm just not quite sure what to ask. I appreciate everyone's help!

Elchanan

That page just pull all of one's blog's settings into that one page. mostly to tweak, in case you didn't want to go into the database.

you will almost never ever change these, even though you can. I think it's mostly there just in case you need to edit someone's broken blog.

Thanks Andrea. :)

Would it be fair to say that your comment applies equally to every settings page in WordPress, give or take? I guess I'm suggesting that it doesn't really matter where I make a given change, on the settings page or in the database. The underlying question as to the purpose of the setting remains the same. At least, I think it does, yes?

Does this seem reasonable, Andrea?

Thank you kindly,
Elchanan

"The underlying question as to the purpose of the setting remains the same. At least, I think it does, yes?"

Yes.

The only one you won't be able to edit from the Edit Blogs page are the ones filled in with "serialized data".