MB_TASKMODAL top-level constant
int
const MB_TASKMODAL
Same as MB_APPLMODAL except that all the top-level windows belonging to the current thread are disabled if the hWnd parameter is NULL.
Use this flag when the calling application or library does not have a window handle available but still needs to prevent input to other windows in the calling thread without suspending other threads.
Implementation
const MB_TASKMODAL = 0x00002000;