Moving windows in taskbar

I forget if the bar at the bottom of the screen is called taskbar or not, but I'm hoping so because then my title made sense. How can I move my application windows along the taskbar? Say I have 5 windows open and I need to switch between the first and last window, can I move the first one to the end? I know I could just use Alt+Tab for a couple of windows, but sometimes my documents are named very similarily, so it'd be convenient if I could put them in an order.

I hope that that made sense, if it didn't let me know and I will try to re-explain.

 

Generally it is hold left mouse button drag and drop ( repeatedly)
You may have to turn a lock control off
These things are maddening to newbies who are shocked that their windows have changed all by themselves
No comment to you - just chuckling at how alarmed some of these people become - end of the world , sky is falling etc etc