Help With Holding Down Keys

HI, I was wondering if there was a function that would hold down key for me.
Here is what I have right now:

$i = 0
While $i < 100
send("g")
$i +=1
WEnd

This does not work because it is not holding down the g key it is repeatedly pressing it. If there is a function that hold down a key that would be great!

Thanks