code: public boolean sendRequest(String requesttype, boolean wantreply,
  			byte[] requestdata) throws SshException {
  		return sendRequest(requesttype, wantreply, requestdata, true);
  	}
docs: Sends a channel request. Many channels have extensions that are specific
  to that particular channel type, an example of which is requesting a
  pseudo terminal from an interactive session.
  
  @param requesttype
  the name of the request, for example "pty-req"
  @param wantreply
  specifies whether the remote side should send a
  success/failure message
  @param requestdata
  the request data
  @return <code>true</code> if the request succeeded and wantreply=true,
  otherwise <code>false</code>
  @throws IOException