In response to another thread, I created a userform with 2 command buttons, 2 textboxes and the following code.
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In a normal module: 
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And the darn thing works. Press Button 2 and another UF appears, type into the new textbox 1 and it is mirrored in UF1.textbox2. Press UF2 button 2, another userform. (the new textbox1 mirrors back to the original userform)
Why isn't this crashing?
What is 
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doing?

Can userforms act like custom Classes, i.e. multiple instances of the same form? Or is there a big problem waiting downstream?

(Mac Excel 2004, Modal Userforms only)