By Inc. Commodore-Amiga
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Extra resources for Amiga ROM Kernel Reference Manual: Devices
The NewScreen structure used with OpenScreen() has been extended with a tag list in V36 to form an ExtNewScreen. This is done by setting the NS_EXTENDED bit in the Type field of the NewScreen structure and adding a pointer to an array of tags to the end of the structure. The NS_EXTENDED bit is ignored in older versions of the operating system, so the tags can be transparently added to existing applications and the features will appear when executed in a system running V36 or greater. h> for more information on NS_EXTENDED and the ExtNewScreen structure.
Screen = screenl; /*. and open the window */ windowl = OpenWindow(seasyWindow); if (windowl == NULL) cleanExit(screenl, windowl, RETURN_WARN); /* Set up the signals for the events we want to hear about ... */ winsignal = 1L << windowl->UserPort->mp_SigBit; /* window IDCMP */ signalmask = winsignal; /* we will only wait on IDCMP events */ /* Here’s the main input event loop where we wait for events. */ /* We have asked Intuition to send us CLOSEWINDOW_IDCMP events */ /* Exec will wake us if any event we are waiting for occurs.
In other words, one application can use a high resolution screen (with 16 colors) while another application uses a low resolution screen (with 32 colors) at the same time. Screens typically take up the entire viewing area so only one is usually visible. But screens can be moved up and down or rearranged allowing the user (or application) to move between screens easily. PUBLIC SCREENS AND CUSTOM SCREENS An application may choose to use an existing screen or to create its own screen. For instance, the normal Amiga start-up process opens the Workbench screen (Workbench is the Amiga’s default user interface).
Amiga ROM Kernel Reference Manual: Devices by Inc. Commodore-Amiga