How to hide a Delphi application.
program Project1;
uses
Forms,
Unit1 in 'Unit1.pas' {Form1},
Windows;
{$R *.RES}
//Declare a var to retrieve current window information
var
ExtendedStyle : Integer;
begin
Application.Initialize;
//Get the Extended Styles of the Application, by passing its
//handle to GetWindowLong
ExtendedStyle := GetWindowLong(Application.Handle, GWL_EXSTYLE);
//Now, set the Extended Style by doing a bit masking operation.
//OR in the WS_EX_TOOLWINDOW bit, and AND out the WS_EXAPPWINDOW bit
//This effectively converts the application from an App Windows to a
//Tool Window.
SetWindowLong(Application.Handle, GWL_EXSTYLE, ExtendedStyle OR WS_EX_TOOLWINDOW
AND NOT WS_EX_APPWINDOW);
Application.CreateForm(TForm1, Form1);
Application.Run;
end.