[TYPO3] How to get values for multiple select

[tonix (Antonio Nati)]

I've set up a complete page, having some <SELECT> field with multiple 
option that can be pressed.

But I've problems on capturing these pressed values, as _GET and 
_POST return me only the first value of the pressed list.

Any hint? Is there any special TYPO3 functions or any setting to do?

Thanks,

Tonino