Error while accessing queue

Hello I am automating skype the desktop application.
Now the scenario is … I have to create a queue for every transaction like one queue for sendingim , one queue to launch meetnow and one queue to share the screen .

And and I trying to put these queues in one flow and keep executing each transactions one by one through get transaction queue activity.

And my doubt is can we use queue apart from Excel application, if yes can we use queues for automating skype and execute the ablove transactions in a flow