He's talking about the $ibl $iel and $iil

you can in theory loop through I guess

alias iblget {
var %x = 1
while (%x <= $ibl(#channel,0)) {
echo -a $ibl(#channel,%x)
inc %x
}
}


alias iilget {
var %x = 1
while (%x <= $iil(#channel,0)) {
echo -a $iil(#channel,%x)
inc %x
}
}

alias ielget {
var %x = 1
while (%x <= $iel(#channel,0)) {
echo -a $iel(#channel,%x)
inc %x
}
}

This will echo the 3