You can search for identifiers within the package.
in-package search v0.2.0
type t
A connection to a named pipe server
val openpipe : string -> t Lwt.t
Connect to the named pipe server on the given path (e.g. \\.\pipe\foo). If the server isn't running then this raises Unix_error(Unix.ENOENT...). If the server is busy then this function blocks.
val to_fd : t -> Lwt_unix.file_descr