Extended list in HTML

Hi all,

I want to create a form field which is a list where I can choose more items
from the list and not only one.
The problem is that I don't know if I can make a list where I can use the
control + space key to choose more options but not contiguous.
Is this possible, or the only solution is to use the shift key for selecting
more options contiguously?

Thanks.

Teddy,
Teddy's Center: http://teddy.fcc.ro/
Email: orasnita(at)home.ro

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