the easy way is to use Print("") something at screen
you can also use Log("") for output window
if you start the ide from debug button in toolbar and the ide have focus you can pause via F9 or from debug menĂ¼.
at pause you see a yellow arrow beside row numbers.
left in tab debug at variables you can copy paste variable names.
in preferences / build you can set a device ip if you will debug at handy (the ip is displayed in agk player) , empty using pc.
AGK (Steam) V2017.05.15 : Windows 10 Pro 64 Bit : AMD (17.4.4) Radeon R7 265 : Mac mini OS Sierra (10.12.2)