When creating and installing channel exits, each defined exit can pass in up to 32 characters of data that can be used for configuration purposes.
创建和安装通道出口时，每个定义的出口最多可以传入32个字符的数据，可以用于配置目的。
If multiple channel exits are defined, you can define multiple sets of user data, separated by a comma.
如果定义了多个通道出口，则可以定义多个以逗号分隔的用户数据集。
Maximum message length can also be defined for a queue manager, a channel, or an individual queue.
对队列管理器、通道和单个队列也可定义最大消息长度。
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