Conscious, $!chan evaluates to produce the string $chan. the exclamation mark is used, in general, to escape identifiers so they aren't interpreted as code. try this:

//echo -a $chan -- $!chan -- $!!chan -- $!identifier($me) -- $!identifier( $me )

for $! the mechanism is very simply expressed as: 'remove the first ! and then leave everything else as plain text up until the next space'.

Teen, there is a big difference between the binary representation of a real number and the binary representation of a string of ASCII text (what those 3 websites deal with). the first concept is central to understanding the binary numeral system. check out:

http://es.wikipedia.org/wiki/Sistema_binario