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I think when you change a template, you just click submit or save or something like that.
That saves your changes and on my sites, the changes are usually instant as long as you don't have cache on the block or module that your altering.
However I think the correct way of updating a template is to make the changes, click on save or submit and then go to the modules admin page and click the icon to update the system 'module'.
I aren't too sure on that, but from what other people have said to me in the past, this is how I understand they do it, something about clicking update makes sure that all the template changes are uploaded to the db.
But might be wrong there, perhaps someone else can give more info.
However as you said it works, I guess theres not much to worry about anyway.
Dave