To specify one or more change requests to associate with a batch of files and avoid displaying the user interface, do the following:
If the automatic associations option is enabled at your site, use this environment variable to specify one or more change requests that you want to associate with files on checkout and checkin operations. The integration uses the change requests that you specify rather than prompting you through the user interface. (Clicking ApplyToAll works only for files being versioned in a single checkin or checkout command. This option lets you handle large batches of files in multiple checkin and checkout commands.)