Global variable from source file to main program

[ocmar]

Hi, I'm new here

My question is: is it possible to use global variable from addon source file in main source file?
In global.gbas I have:

Code (glbasic) Select Expand

GLOBAL K_ESC% = 01
GLOBAL app_state%
and I use it in main file app01.gbas:

Code (glbasic) Select Expand

IF app_state% = APP_RUN% THEN PRINT "App Run", 10, 10
In output window I have:
"app01.gbas"(17) error : variable is not explicitly defined : app_state.
I don't find answer on the forum.

PS. Sorry for bad English

Edit: Ok, sorry, I'm stupid
In top of app01.gbas now i have:

Code (glbasic) Select Expand

GLOBAL K_ESC%
GLOBAL app_state%
and it's work. This looks like a extern i C .