Here we put together three basic constructions of functions from two ones: the active (front) function called HH and the below function called HS. So this menu is active only when at least two documents are present. A new document is created and its name is computed (taking into account the operation and the two components names). The algorithms are generally polynomial in the size of the components. Under a separating bar, all the documents are listed from the top (active document) until the low (the least active one). Acting with mouse on some document of the list puts it in the top (making it active). One can thus control the two components and their order to operate.

The Operations menu contains the following items: