Thanks, it worked!

However, i have a new problem now ....

code:
"
///////////////////////////////////////////////////////////////
#include <acknex.h>
#include <default.c>

typedef struct {

var Active;

} LISTBOX;

LISTBOX* ListBoxArray[100];

var Debug_1 = 0;

function extra()
{
while(1)
{
Debug_1 = ListBoxArray[0].Active;
wait(1);
}
}

function main()
{
level_load("");
wait(3);

LISTBOX Test;
ListBoxArray[0] = &Test;
ListBoxArray[0].Active = 1;
extra();

}
PANEL* Debug_Pan =
{
flags = VISIBLE;
digits = 100,100,8.4,*,1,Debug_1;
}
"

The panel should display "1"...I think...but it shows "2040952.2500"...
I am sure I there's something wrong, but I do not find it!

Using this code (with the loop in the main function) the panel displayed "1":
"
///////////////////////////////////////////////////////////////
#include <acknex.h>
#include <default.c>

typedef struct {

var Active;

} LISTBOX;

LISTBOX* ListBoxArray[100];

var Debug_1 = 0;

function main()
{
level_load("");
wait(3);

LISTBOX Test;
ListBoxArray[0] = &Test;
ListBoxArray[0].Active = 1;

while(1)
{
Debug_1 = ListBoxArray[0].Active;
wait(1);
}
}

PANEL* Debug_Pan =
{
flags = VISIBLE;
digits = 100,100,8.4,*,1,Debug_1;
}
"