Parenthetical elements are wrapped in parentheses, and follow a Character or Dialogue element.
SALESMAN (smiling) Ya wanna know the secret of successful air travel?
Parentheticals may also be inserted into the middle of Dialogue, like this:
GORMAN Oh, great. Wonderful. Shit! (into mike) Uh, Apone...look, we can't have any firing in there. I, uh, want you to collect magazines from everybody.
You can copy/paste or drag/drop these examples right into Slugline to see them in action.