Question?

[v3001]

hi,
i think most of you know the @castspellunit code.
but i got two questions:
the first:
i am unit 100000013 if im host. player two is 1000000014. but if i enter for example: @castspellunit("healing",0,0,xxx) what do i have to write in xxx to get the spell on me or any other players. for me i can enter getleader(), but for other players? please help me.

question 2:
what does the code @cast(???) do, and how is it used in the right way?

cya