Found here, no logging in necessary:
https://www-ssrl.slac.stanford.edu/webxas/xdc_v2/help_guide.php
XAS Data Collector Getting Started.pdf
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Logging In
Using your web browser, navigate to: https://www-ssrl.slac.stanford.edu/webxas and click Continue to XAS Data Collector.
Enter the email address and password associated with your SLAC User Portal account and press Login.
After you successfully log in with your User Portal credentials, you will be asked to enter your beam line computer account. This is the username that your group has been given and typically starts with "b_". You will also need to select the beam line that you are running on.
Overview
Web XAS is a browser-based interface for the XAS Data Collector on the beam line computer. Web XAS executes a queue of various item types (XAS experiments, time scans, motor moves, etc.) and provides the tools to edit the queue items as needed for the user's experiment.
Setting Up An XAS Experiment