When you initially create a portal it looks like a colored rectangle with a drop shadow. Here we have created a portal over a squiggle on the Pad++ surface.
Click on the next button to go on.
When you select the portal and move it away, it drags off a copy of what was underneath it.
Click on the next button to go on.
In fact, however, it isn't a copy - its the 'real thing' - its another view onto the same part of the Pad++ surface. So when you draw a second squiggle next to the first, it appears in two places... on the Pad++ surface, and within the portal's view of the Pad++ surface.
Click on the next button to go on.
Each portal has its own independant view - you can pan and zoom inside a portal without changing the view outside the portal. Here we see the portal looking at a zoomed in view of the squiggle and line.
