• True if the background image was modified,
• False otherwise.

Name of the window to be used.
If this parameter corresponds to an empty string (""), the current window is used.

Name and full (or relative) path of the image to display in the window. A UNC path can be used. No image is displayed in the window if this parameter does not correspond to an existing image.

Indicates the display mode of the image:

imgCentered	Centered: Image centered in the window.
imgH	Homothetic: Image enlarged or reduced (by respecting the proportions of the initial image) to occupy the entire surface of the window.
imgHC	Homothetic centered: Image enlarged or reduced (by respecting the proportions of the initial image) and centered in the window.
imgHCE	Homothetic centered extended: Image enlarged or reduced (by respecting the proportions of the initial image) so that the smaller side of the image is entirely displayed in the window and centered in the window.
imgHCWIS	Homothetic centered without enlargement: If the image can be entirely displayed in the window, it is displayed at 100% and centered in the window. Otherwise, the image is proportionally reduced so that it can be entirely displayed and centered in the window.
imgHE	Homothetic extended: Image enlarged or reduced (by respecting the proportions of the initial image) so that the smaller side of the image is entirely displayed in the window.
imgHWIS	Homothetic without enlargement: If the image can be entirely displayed in the window, it is displayed at 100%. Otherwise, the image is proportionally reduced in order to be entirely displayed.
imgNormal	100%: Image displayed at 100% in the top left corner of the window.
imgStretched	Stretched: Image stretched across the entire surface of the window.
imgTiled	Tiled: Image displayed at 100% and tiled to occupy the entire surface of control (tile).