> ## Documentation Index
> Fetch the complete documentation index at: https://docs.atomscale.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Screen Capture

> Stream instrument data by recording your screen

Screen capture lets you record a window on your computer and stream frames to Atomscale in real time. This is currently used for RHEED data: frames are captured from your RHEED software window, uploaded continuously, and analyzed with the RHEED Fingerprinting workflow.

## How to Stream

<Steps>
  <Step title="Open the Add Data dialog">
    Click <Badge stroke color="blue">Add Data</Badge> in the sidebar, then select the <Badge stroke color="blue">Stream</Badge> tab.
  </Step>

  <Step title="Choose a capture source">
    Click <Badge stroke color="blue">Choose source</Badge>. Your browser will prompt you to select a window, screen, or tab to capture. Selecting from the <Badge stroke color="blue">Window</Badge> section is recommended for best results.
  </Step>

  <Step title="Position the capture area">
    A live preview of your selected source appears. Drag and resize the capture area overlay to frame the region you want to record.
  </Step>

  <Step title="Configure stream settings">
    Fill in the configuration form:

    | Field                    | Description                                                                          |
    | ------------------------ | ------------------------------------------------------------------------------------ |
    | **Data Name**            | Defaults to "RHEED Stream @ \[Date]". Change it to something descriptive.            |
    | **Physical Sample**      | Optionally associate the stream with a sample.                                       |
    | **Workflow**             | Currently fixed to **RHEED Fingerprinting**.                                         |
    | **Stage Rotation (rpm)** | Set the rotation speed for rotating-stage growths. Leave empty for stationary RHEED. |
  </Step>

  <Step title="Start streaming">
    Click <Badge stroke color="blue">Start Stream</Badge>. Frames are captured and uploaded in the background.
  </Step>

  <Step title="Control the recording">
    While streaming you can <Badge stroke color="blue">Pause</Badge>, <Badge stroke color="blue">Resume</Badge>, or <Badge stroke color="blue">End Stream</Badge>. An elapsed-time timer is displayed in the controls.
  </Step>
</Steps>

<Tip>
  You can close the Add Data dialog while a stream is active. The recording continues in the
  background, and the sidebar button shows the stream status.
</Tip>

## Interrupted Streams

If a stream is interrupted (for example, by closing the browser tab), Atomscale detects the incomplete stream. The next time you open the <Badge stroke color="blue">Stream</Badge> tab, you will be prompted to resume or discard it.