Remote Control a Mac with Screen Sharing in Mac OS X

What is iOS Screen Sharing?

iOS Screen Sharing - Remote Desktop to Mac OS X and See the iPad/iPhone Screen
Before you attempt a screen sharing connection, the person who will be sharing their screen with you should do the following:. January 18, at 9: Depending on the network devices used, these ports can either be opened completely, or forwarded to the local IP address for the desired computer, but you will have to consult the documentation for your router to see about how to change these ports. October 11, at 2: Screen Sharing is an extremely useful feature if friends regularly ask for help with OS X or vice versa.

Share your voice

Access the VNC Client in Mac OS X & Create a Screen Sharing App Shortcut

Before other computer users begin screen sharing your Mac, they can ask for permission instead of entering a user name and password. VNC viewers may control screen with password: Other users can share your screen using a VNC viewer app—on iPad or a Windows PC, for example—by entering the password you specify here.

If you select this option, you should create a very secure password. Before you start, make sure the Mac whose screen you want to control has screen sharing turned on. Open a Finder window. If no shared computers appear in the Shared section of the sidebar, put the pointer on the word Shared , then click Show. Click All to see all available computers, then double-click the one whose screen you want to share.

If both computers are logged in using the same Apple ID , the screen sharing session starts. If someone else is already connected to the Mac as a remote user, a dialog asks if you want to share the display with the other remote user Share Display or log in concurrently using a different user name and screen Log In.

Domain ] in the Server Address field. To find the address of a shared Mac, open Sharing preferences on that Mac, then select Screen Sharing. To decide which option you want, try each one by selecting it and then moving the pointer around in the window.

For the best results, and if your Mac is connected to a fast network, view the screen at full size and show the screen at full quality. To unblock users, select them in the list and click the Remove button. With scaling on, the entire screen of the shared Mac is displayed on your screen. With scaling off, the shared screen is displayed full size, and might require you to scroll to see everything on the shared screen.

In Control Mode, you control the shared screen. Use this option if your Mac is connected to a slower network.

Adaptive quality adjusts depending on network speed. Use this option if your Mac is connected to a fast network and you want full resolution. Show or hide the toolbar that displays buttons for adjusting the scale, sharing the Clipboard, and other options. The screen sharing window expands to fill your screen. To see the toolbar and menus, move the pointer to the top of the screen. Screen Sharing can now be enabled successfully. You can only use one service or the other. You need Remote Management enabled if you are using Apple Remote Desktop software which I am not covering in this article.

If you don't see a Shared section in the Sidebar, try one or more of the following, as needed: The Shared section of the Sidebar on the left and the Share Screen button on the right. If you select the former, you must enter a name and password for an account that is on the other person's computer. It does not have to be the name and password of the currently logged in account.

As you will often not have access to any account on someone else's computer, the permission option is the one you will likely use most often. In this case, similar to what I described for iChat, the recipient sees a message asking them to give permission for you to share their screen.

They should do so. The permission option is not only more likely to be the appropriate choice, it may sometimes be the only choice that works. In particular, I have been unable to get the password option to work when attempting to connect to a computer running Tiger with Apple Remote Desktop sharing enabled. Instead, an "Authentication failed" error pops up. I am not sure why. However, switching to "Asking for permission" was successful.

Both the permission and password options were successful when connecting two machines running Leopard. Make a remote connection. Remote computers are not listed in the Sidebar. Thus, to connect to a remote computer:. As an alternative to using Connect to Server, you can instead launch the Screen Sharing program directly. If you wish, for easier access, you can make a copy of the program and place it on your Desktop or wherever else you want ; the program should still work.

To use it, enter the needed IP address in the Host text box, but without the vnc: A successful remote connection is far from guaranteed. The first problem will be identifying the correct IP address. That is the local IP address for the machine. An additional problem occurs if the other person has more than one computer connected to their router. In this case, even if you use the correct public IP address, the other person's router does not necessarily know which machine to direct your sharing request.

Details on how to do this go beyond the scope of this article. That's the way it's supposed to work. Personally, even after fiddling with all of the above settings, I have never been able to make a successful remote connection. Suffice it to say that for remote connections, you should probably use iChat instead.

If a user attempts to access screen sharing via the Finder with the password option, no alert appears on the other computer that a connection is being attempted. If the attempt is successful, there is similarly no message that a connection has been made. This means that someone could connect to your computer via screen sharing without your even knowing it.

The implications here are even worse than you may think. For example, I was able to access another computer via screen sharing by using the name and password for a standard account on that computer, even though the currently logged-in account was for a different admin user. Once the connection was made, I apparently had almost complete access to the other person's account. For example, I could delete files from their Home directory! Certainly, I had more access than I would have had if I logged into the standard account on the machine itself.

I was given this access without the user's awareness or direct permission? To me, this is a serious security weakness that Apple should close up. In the meantime, assuming you want to have Screen Sharing enabled at all, you can limit the risks by going to the "Allow access for" section of the Screen Sharing preferences and changing "All users" to "Only these users. If you are a MobileMe subscriber, Leopard includes a feature that was introduced back when MobileMe was. You might use this feature, for example, to access your home computer from your laptop while you are on a trip.

Back to My Mac is really a special case of the just described method of using the Finder and the Screen Sharing program. Assuming all goes well, you should be instantly connected to the other computer. There is no need to request permission or enter a password. First, Back to My Mac did not work for remote connections.

In particular, the remote Mac never even appeared in the Shared section of the Sidebar. Others have reported this as well. One cause may be incompatible router hardware, as described in an Apple Knowledge Base article with more information in a related Knowledge Base article.

The second problem is almost the opposite of the first one: For local connections, I could not turn Back to My Mac off. It had no effect. You may think this is due to Back to My Mac still being active, but for local connections Apple uses Bonjour networking to establish connections, so even though Back to My Mac is off you will still see local computers present a "Share Screen" option.

Even though the built-in screen sharing client is stripped down, a few of the features from the advanced Apple Remote Desktop software are available. The following are ways to enable some of these features:. This will add options to limit the image quality with a slider, which can be beneficial for some network situations.

It also allows for observing as well as controlling other computers, enabling or disabling the remote computer's keyboard, taking snapshots of the remote screen, swapping clipboard contents, and displaying the remote computer at full screen on the local computer. Since this technology sends images of the screen over the network or internet, there will be some performance degradation if the connection is slow, regardless of the means of connection ie: The main factor in speed for any connection is basically how much information is being changed on the screen at any one time.

Therefore, one way to reduce network load is to make windows smaller when moving them around. This can be impractical in some situations, but can be useful when, for instance, you are copying many files around.

The "Screen Sharing" client that comes with OS X does have a few additional options that you can take advantage of for either increasing quality or network speed.

By default, the screen is set to be adaptive to network conditions, and only updates enough to show what's going on, and then updating more when the network resources are available to do so. This can be set to run at full quality for people on high-speed local networks by starting a sharing session and from the "Screen Sharing" preferences choose the option to "Show the screen at full quality".

Optionally, you can enable an image quality slider see the "Further Customization" section For the most part, broadband internet connections should keep the adaptive quality settings and expect up to a half-second lag in the response time. As with any other network service, Screen Sharing has a set of virtual "ports" which isolate network traffic for that protocol since it and web traffic and other network services are all using the same IP address and connections.

These ports must be opened in all network devices for all computers involved in the screen sharing sessions. This means firewalls on the local computer, as well as any routers or hardware firewalls must also be set up to pass traffic on the following ports:.

Depending on the network devices used, these ports can either be opened completely, or forwarded to the local IP address for the desired computer, but you will have to consult the documentation for your router to see about how to change these ports. The list of routers in this Apple Knowledgebase article are some that support Back to My Mac and other screen sharing. Remote Desktop can be exceptionally useful for connecting to other platforms besides OS X.

On Intel macs Apple claims that access to PC programs can be done via Bootcamp or virtualization solutions such as Parallels or VMware; however, a more simpler solution is available if you have a Windows PC that is already set up with the software you need.

Microsoft has implemented its own version of Remote Desktop into Windows XP and later versions of the Windows operating system. By enabling screen sharing on those systems, you can connect to them using Microsoft's "Remote Desktop Connection" software package. All you will need to know is the IP address, DNS name, or local name of the computer to which you are trying to connect.

Share the screen of another Mac

Leave a Reply

How can the answer be improved?Tell us how. Oct 10,  · Screen Sharing will work across just about any supported Mac OS X versions too, a Mac running MacOS High Sierra, Mac OS Sierra, OS X El Capitan, Yosemite, Mountain Lion, Mavericks, and anything newer, can connect to a work Mac running Snow Leopard, and so on. Mar 28,  · macOS Sierra: Set up and use screen sharing When you’re sharing the screen of another Mac, you can set screen sharing preferences to adjust the size and quality of the shared screen. move windows, open and close documents, or do other tasks. If you’re observing OS X v or later, you can click and hold to highlight .