[PD] How does vline~ work under the hood?

[i go bananas]

Thanks,

I guess here is my question put better:

If i make a line and a vline object, and feed them both a [1, 0 50(
 message, they perform differently.  The line object jumps around,
presumably cos it is tied to block boundaries.
But the vline always triggers exactly the same.

It's as if somehow the vline~ works outside of the block structure.  Does
it actually do that?  Say you're at sample 47 of a 64 sample block, does
vline jump the queue and trigger right then?

Or i guess, even more succinctly, i was assuming that everything in pd got
triggered in blocks.  Is that the case?  Does vline also have to wait for a
block boundary when first triggered?

Sorry, there's obviously some 'aha' moment i'm failing to have here.
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