Permalink
PL stands for permalink. A PL is an URL like this one referring to two streets in Maastricht:
https://www.waze.com/nl/editor/?env=row&lon=5.69234&lat=50.84942&zoom=5&segments=58976438,59083453
- The first parameter specifies the environment where row stands for rest of the world.
- Next attribute specify the geographic coordinates to the position of a point on the Earth's surface via the longtitude and latitude
- Third attribute is the zoom level
- Fourth optional attribute are referring to selected segments.
Creating a PL
For locking / unlocking requests a PL should be supplied with all involved segments. From the WME screen create a PL by adjusting the zoom level so all segments to select are visible. While using the Ctrl-key select all involved segments. Then create a PL by clicking the 
symbol bottom right corner of your screen. The PL is now created as URL in your browser.