Well you can use $r, but to be honest it's best for readability to use $rand, also $r is an old identifier, not mentioned in the help file anymore, it might be gone some day.
I only put it because I know what I'm doing (and I like shorter code), though perhaps I should start using $rand.
Greets
Do u know if it just happned to br $r or if it might have been shortened on purpose to let you get the max out of a $($str($!r(...) $!+ $chr(32),N),2) ? Becuase thats where i first saw a $r used to build a 20 letter random text values
