• You no longer need to create a message filter to route data to more than one channel. To route data to multiple channels, specify To Channel as the destination component of the channel whose data you want to route. Then, specify From Channel as the source component of each channel that is to receive the routed data:

For more information, see To Channel and From Channel.

• You can now add a filter to any channel that you create:

This means that the To Message Filter destination component and the From Message Filter source component are no longer needed. See Configuring the Filter for more information.

	When you upgrade from Iguana 3.3 to Iguana 4.0, any channels that use From Message Filter as the source component are converted to use From Channel as the source component. Any channels that use To Message Filter as the destination component are converted to use To Channel as the destination component.

• The Client Executable channel components are now called To Plugin and From Plugin:

For more information, see From Plugin and To Plugin.

• Converting to and from XML format is now performed by the message filter that can be optionally provided for any channel. For this reason, the To XML destination component and the From XML source component are no longer needed.

	When you upgrade from Iguana 3.3 to Iguana 4.0, any channels that use From XML as the source component are converted to use From File as the source component. A filter is added for this channel, and the filter's transformation mode is set to XML to HL7. Any channels that use To XML as the destination component are converted to use To File as the destination component. A filter is added for this channel, and the filter's transformation mode is set to HL7 to XML.

• When you create a channel that uses LLP Listener as a source component, you no longer need to provide both positive acknowledgment (ACK) and negative acknowledgment (NACK) VMD files.

This is because, in Iguana 4.0, the LLP Listener source component receives each message, adds it to a queue, and sends an ACK to indicate that the message has been received. The destination component of the channel then takes messages from the queue and processes them. This can greatly improve the rate at which Iguana receives messages from the LLP Listener.

	You can use Python scripts to selectively generate NACK messages for an LLP Listener source component. See Generating NACK Messages in Iguana 4.0 and Later for more details.