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How is plugin network activate different from normal activation by implementation? What is done/not done in network activation that is done/not done in activation?

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Network activation will activate a plug-in for every site in a network whereas regular activation will only activate a plug-in for the site you're currently on. As far as implementation goes, there is one other important difference:

If your plug-in is built to do something when it's activated (via register_activation_hook()), this will fire automatically when you activate a plug-in normally, but it will not fire for a network-activated plug-in until you visit the admin screen for each blog.

So if major database updates are tied in to register_activation_hook() they won't occur until you log in to the other sites.

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The super-admin or the admin should visit the site.com/subblog/wp-admin URL for plugins' activation hooks to be executed? Or do you mean that they must go to the plugin page of the sub blog and then click on the "activate" link? – rsman Nov 17 '10 at 2:06
They must visit the wp-admin url for the plug-ins' activation hooks to be executed. – EAMann♦ Nov 17 '10 at 2:09

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