HINSTANCE question

[sublime99]

I wish to create a window in my application in addition to the main window. Can I use the HINSTANCE received in int WINAPI WinMain(HINSTANCE hInst,HINSTANCE,LPSTR pStr,int nCmd) or can I use NULL or 0

Thanks

[Igor Vartanov]

While creating window, provided hInstance must be NULL or equal to hInstance registered to window class.