If you've accidentally left Skype open on another computer or device, there's an easy way to sign out from somewhere else. All it takes is a simple command line within the app.
Photo by Allan Henderson.
Some apps, like Gmail, give you an easy way to sign out of other devices (from Gmail, you can scroll to the bottom of the screen and hit Details under "Last account activity"). Skype doesn't include its own feature for this, but as Addictive Tips explains, all you have to do is enter the command /remotelogout in any Skype conversation. This text won't be visible to other people in the conversation, but it should shut down any of your sessions on other devices.
For more detail, head to their full post at the link below. They also include a way to check if you're logged in anywhere else in the first place.
How To Remotely Sign Out Of Skype [Addictive Tips]