Interfacing with Kdb+ from C( https://code.kx.com/trac/wiki/Cookbook/InterfacingWithC ) says: ... The k function is used to send messages over the connection. If a positive handle is used then the call is synchronous otherwise it is an asynchronous call. ..
What does this mean? K r=k(0, "f", arg1, arg2, NULL); // handle = 0