Syntax: force_input (OBJ conn, STR line [, at-front]) => none
Inserts the string <line> as an input task in the queue for the connection <conn>, just as if it had arrived as input over the network. If <at-front> is provided and true, then the new line of input is put at the front of <conn>'s queue, so that it will be the very next line of input processed even if there is already some other input in that queue. Raises E_INVARG if <conn> does not specify a current connection and E_PERM if the programmer is neither <conn> nor a wizard.