A string naming a file containing an image to be displayed when the application starts.
On Microsoft Windows, the image needs to be in Windows Bitmap format and must be Indexed Color rather than RGB color.
On Cocoa, GTK and Motif, the image can be in any format supported by Graphics Ports, and the file will be read as if by
gp:read-external-image. See the "Working with images" section in the
CAPI User Guide and Reference Manual
On Windows the user can dismiss the startup screen by clicking on it. It can be dismissed programmatically by calling
win32:dismiss-splash-screen - see the
LispWorks User Guide and Reference Manual
nil means no bitmap is displayed.
LispWorks Delivery User Guide - 10 Aug 2017