Help! How to access App's variables?

[Spybot]

Hello!
I'm trying to implement a graphical interface for a program, and I need to create some variables within the Geometry App (points, segments, lines etc...) so when I STARTAPP the Geometry App it shows all the stuff I created earlier. I already tried creating variables GA, GB, GC... etc but they don't show in the Geometry's plot view.
Does anyone know how this is done?

EXPORT aaa()
BEGIN
LOCAL GA,GB,GC;
GA:=point(1,1);
GB:=point(5,6);
GC:=segment(GA,GB);
STARTAPP("Geometry");
END;

this code does pretty much nothing!