Before other people sharing your computer can access your Steam library you'll need to authorize the device and their account.
Authorizing a device can be done by opening the Steam Client and clicking on the Steam button located on the menu at the top left. Once you have the menu open click on Settings.
Mac users will need to choose Steam and then Preferences from the applications menu at the top of the screen.
From the Settings page select the Family tab.
To authorize the device you're currently using select Authorize this Computer button.
Once authorized you'll be able to select which Steam users you want to grant access to your library. The list will only contain accounts which have logged into Steam using that device.
From now on if an approved account logs into Steam from the device you gave authorization to they will be given access to play games from your Steam library if it's not in use. You can return to Family tab within the settings menu at any point to view which account has been using your library and when.
Other users using an authorized device can view your library by using the filter tool near the top of their games list and selecting your username.
Steam libraries can be accessed by one person at a time across all devices. If you're playing a game from somebody's library and they begin playing a game themselves, you'll receive a notification stating you have a set amount of time to exit your current session.
As the account holder you'll always have priority access over your library.
If somebody else has used Steam on your computer and installed a game, but has not authorized the device for Steam Family Sharing, you can request access to their Steam library. Any game installed through Steam by any user will appear on your Steam library beneath their account name.
Locate one of their games and click on the Play button. You'll then be given a prompt which will ask you if you want to request access or purchase the title for yourself. To request sharing access click on the Request Access button.
You'll then be required to give your device a name so the person you're requesting access from can identify it.
Once your request has been sent you'll get a confirmation notice. The person you're requesting access from will receive an email letting them know that you would like access to their Steam library.
Once the request has been accepted you'll be able to access their full Steam library if it's not currently in use. The person you requested access from will also see the device listed on their Authorized Devices screen in their Steam settings.
If you'd like to revoke access to your Steam library for one or multiple devices you can do so by visiting the Family tab within your Steam Settings.
From this screen you can choose to deauthorize the device you're currently using by selecting the Deauthorize this Computer button. You can also choose to revoke library access to a specific account by unchecking the box next to its name on the list.
If you'd like to restrict library access from a device that you're not currently using you can select the Manage Other Computers button. This will direct you to a Steam Community webpage where you can choose to revoke access from all of your authorized devices and accounts.
If you have any questions or comments regarding this guide please feel free to leave a comment below or get in touch with me on Steam or through my website[www.Jimo.co.uk].