Application in background problem

Hi All,

My application does lot of things related to network. Sending and receiving lot of data thrg sockets. I have few querries ..

1. If I move the application to background at the startup( Launch of my app ), the app is freezed at splash screen. I do lot of image loading at the time of splash screen( nearly 150 PNG images ). Now what is causing my images not to get loaded if my app is in background. If I bring it to foreground .. images get loaded and everything after thats works fine.

Following code I am using to put the app in background:

RWindowGroup* wg;
wg = &CCoeEnv::Static()->RootWin();
wg->SetOrdinalPosition(-1);



2. If sereen saver appears, network activity( socket read and write data ) of my application stops. What can be the reason behind this? 


Can anyone plz help me to solve these problems? 

thanks in Advance.

..
KiraN Puranik