There are several mechanisms for displaying messages and notifications to the user. The following methods and macros can be used to display text messages:

• Kernel::HUDMessageShow() - Displays a message as text overlay, also called the head's up display (HUD), in the 3d view. Hide the HUD with Kernel::HUDMessageHide().
• Kernel::SetStatus() - Displays a message in the status bar.
• Kernel::MessageBox() - Displays a modal dialog box to the user.
• MB_ERROR - A macro that creates an Error object and display an error message.

The following are non-textual notifcation mechanisms to indicate progress, or that a lengthy operation is taking place:

• Kernel::WaitCursorStart() - Shows a wait cursor. The cursor can be restored using Kernel::WaitCursorEnd().
• Kernel::ProgressStart() - Displays a progress bar.
• Kernel::ProgressSet() - Updates the current progress bar.
• Kernel::ProgressAdd() - Updates the current progress bar, by adding one to the progress value.
• Kernel::ProgressEnd() - Removes the current progress bar, whether or not the process is complete.