Changing the Streams

In the IBM-supplied default environment, nine streams have been defined. You cannot change the names of any of the streams, but you can use the CHANGE.STREAM command to:

Erase the information in a stream
Change whether the terminal's audible alarm sounds when information enters the stream.

The following figure summarizes the attributes of all of the streams in the default environment. It identifies the stream name, type, size (in lines and bytes) and indicates whether the audible alarm sounds when information enters the stream.

Table 1. Streams
Stream Name	Type	Linesize	Bytesize	Alarm
TSOIN	Input	305	8192	No
TSOOUT	Output	4005	147456	No
SMIN	Input	305	8192	No
SMOUT	Output	155	4096	No
MESSAGE	Output	55	1024	Yes
EXTRA1	Output	405	32768	No
EXTRA2	Extra	105	1024	No
EXTRA3	Extra	105	1024	No
HEADER	Extra	55	1024	No