Use Teacher Commands During Class Sessions
Teacher commands can be used to interact with your students during active classroom sessions.

Lock / Unlock Screen
The lock screen command will mute and disable all Chrome windows on your student's device. The command is designed to unlock at the end of the session, but if a student joins a new session before the first session ends, they will remain locked. 
 To lock a student's screen:  
 
 Select one or more students using the checkbox to the left of each student's name 
 Click the Lock / Unlock device button 
 (Optional) enter a custom message to be displayed on the locked screen 
 Click Lock devices on the Lock / Unlock Devices confirmation popup window 
 
 
 Devices may also be locked or unlocked by clicking the Lock / Unlock device button on the command bar and then making lock / unlock selections. 
 
   
 To unlock a student's screen: 
 
 Select one or more students using the checkbox to the left of each student's name 
 Click the Lock / Unlock device button 
 On the Lock / Unlock devices popup window, click the Unlock button 
 Confirm by clicking the Unlock devices button 
 
 
   
 If the student's device does not unlock after 30 seconds, reboot the student's device, wait for the student to connect to the session, and then issue the unlock command again.

Open / Close Tab
The Open Tab command allows teachers to direct students to any web page by entering a URL to be opened on the selected student's screens.   
 Opening a Tab for Multiple Students 
 
 Click the Open Tab button 
 Check the boxes next to Select All or choose specific students and click Next 
 Enter a URL in the Open Tab interface and click Open Tab 
 
 Opening a Tab for One Student 
 
 Click the 3 dots button in the corner of a student's tile 
 Select the Open Tab button 
 Enter a URL in the Open Tab interface and click Open Tab 
 
 
   
 
   
 To close a tab: 
 
 Click on a student's tile (their screen view) 
 Identify the tab you would like to close on the list 
 Click Close to the right of the URL 
 
 
 
   
 Note: It can take up to 10 seconds for the closed tab to disappear from your Teacher dashboard.

Take a Screenshot
Using Screenshot , you can quickly document student screen activity to reference later. Screenshots are saved along with other past session data on the classroom's Sessions tab. 
 To take a screenshot: 
 
 Click the screen of the student 
 Click the camera icon on the bottom right corner 
 
 
   
 To view screenshots from the current session: 
 
 Click the Screenshot tab under the class name 
 Click Download Screenshot or save to Drive

Exclude and Include Students
Students who are absent can be excluded from your classroom session with the Exclude command. This command will temporarily hide the student from your Screens and Timeline views. Students can be excluded and re-included at any time during your session. Excluding a student will not delete them from your roster. 
   
 To Exclude One Student: 
 
 Click the 3 dots button in the corner of a student's tile 
 Click the Exclude student button 
 
 To Exclude Multiple Students 
 
 Click the Exclude from session button 
 Select All or check the boxes next to specific students 
 Confirm by clicking the Exclude students button 
 
 
 
   
 To Include a Student: 
 
 Find the excluded student's tile 
 Click the Re-include Student button

Annotate
With the Annotate Student Screen feature, teachers can place a colored circle on the webpage that the student is currently browsing to help guide them. On the student’s side, the circle will appear for ~10 seconds and then disappear. Teachers may also change the color and size of the pointer by using the Pointer Color and Pointer Size options.  
 This option is available on the bottom right of a student's screen view: 
  

Issue Individual Commands from a Student's Tile
Teachers can also issue the following commands to individual students by clicking on the three vertical dot menu in the top right corner of a student's tile: 
 
 Lock / Unlock Screen 
 Open Tab 
 Exclude Student 
 Start a Chat (if chat is enabled for the active session)