A:

Here is the idea:

a) In the project file (*.dpr) add '{$D SCRNSAVE <saver name>} after the uses clause.

b) On the main form, turn off the border and icon controls. In the  activate method set the form left and top to 0, and set the WindowState  to wsMaximize.

c) In the form create method, set the application.OnMessage event to a method  that controls the deactivation of the screen saver. Set the  application.OnIdle method to whatever display method for the saver.

d) In the form create method the command line should be tested for /c and  /s. These are the command line parameters windows uses to define whether  the screensaver should run or configure. (/c is for configuration)

e) Compile the program, and rename the .exe to .scr. Move it to the windows directory, and it should show up in the control panel.