Hi, I'm David, Davo or DBannon, as you like.
A new Lazarus user in 2017, I once used Delphi One and Two, long long ago, in a universe far away !
I use this page to 'bookmark' some pages I keep referring back to but always have problems finding.
https://wiki.freepascal.org/Platform_defines should mention Widget Set Defines, LCLGTK2, LCLGTK3, LCLQT5 etc
http://wiki.freepascal.org/Cocoa_Internals/Application - mention of clipboard