APEX

Hi,

I am having a report in my 1st page using the code

select 
apex_item.checkbox(1,"EQUIPMENT_ID") Tick,
EQUIPMENT_TYPE as "Device Type",
EQUIPMENT_NAME as "Device Name",
 CUSTOMER_NAME as "Customer Name",
 SITE_NAME as "Site Name"
 
  from DEVICE_VIEW

In the page process of this page can we use APEX_APPLICATION.G_F02,*APEX_APPLICATION.G_F03* for

refering EQUIPMENT_TYPE,EQUIPMENT_NAME?

My second page has code

select
apex_item.checkbox(1,"INTERFACE_ID") Tick,
INTERFACE_TYPE as "Device Type",
INTERFACE_NAME as "Device Name",
 CUSTOMER_NAME as "Customer Name",
apex_item.checkbox(2,"EQUIPMENT_ID") Tick,
 SITE_NAME as "Site Name"
 
  from INTERFACE_VIEW

Can i use this way? How can we identify each filed using the APEX_APPLICATION.G_FXX? in the page process.

If my understanding is wrong what exactly is APEX_APPLICATION.G_FXX?. Please help,

Thanks
TJ