View a stream as of a specific changelist

The StreamAtChange option in the client spec lets you use the version of the stream specified as of a particular changelist to generate a workspace view. This is helpful when you want to see what the stream view was at a particular point in time, especially if your stream spec changes a lot (for example, if you frequently change what you’re importing or what you’re deciding to share). When you use the StreamAtChange option, you cannot submit changes to the files in the stream, since your workspace view is not up to date.

To set a stream workspace to use the version of the stream specified as of a particular changelist, do the following:

Open the stream’s workspace specification form for editing.
```
$ p4 client
```
Use one of the following alternatives:
1. Edit the form to set StreamAtChange: to the changelist you want to view the stream as of. Or,
2. Issue this command:
```
$ p4 client -S //Ace/main@12546
```

For more information, see the Helix Core Command-Line (P4) Reference.

Alternatively, you can issue the following command to sync a stream using the stream’s view as of a specific changelist:

$ p4 switch [-r -v] stream@change

This command both sets the StreamAtChange value and syncs to the same change.