built-in shelf
 Represents OmniMark's current output, a collection of output destinations.
        
process put #current-output "Hello, World!%n"is thus equivalent to:
process output "Hello, World!%n"
 This isn't very useful in itself, but it allows you to add an item to the current set of destinations:
        
global stream s process local stream t open s as buffer open t as file "t.txt" output-to s put #current-output & t "Hello, World!%n" using output as #current-output & t output "Salut, Monde!%n"