s, a string, of the form "$:service", where service is replaced by the name or number of a service port, or of the form "$"
Outputs:
f, a file, an open listener on the local host at the specified service port, which is taken to be port 2500 when s has the second form
Description
Use openInOut f to accept an incoming connection on the listener, returning a new input output file which serves as the connection. The function isReady can be used to determine whether an incoming connection has arrived, without blocking.