Show / Hide multiboard for players?

How do you show/hide a multiboard for a player or a player group?
And can it only be done through JASS?

And is it possible to change the level of a heroskill through triggers/JASS?

1. Get UMSWE or WEU (there you will find the function Local Player)

To show a multiboard for player one this will work:

If Local Player is equal to Player 1 Then
Show Multiboard <your mb variable>
Else
Do Nothing
Endif


2. There is a function, it's called Hero - Set skill level or something like that.