_Added in 1.9.0_

*$isid*

Returns [[$true]] if an alias was called as an identifier, otherwise [[$false]].

*Example*

<pre>
; Create an alias
alias example [
  if ($isid) {
    echo -ag Was called as a identifier.
  }
  else {
    echo -ag Was not called as a identifier.
  }
}

; Call 'example' as a alias.
/example

; call 'example' as a identifier.
//noop $example
</pre>