This smample show how to start only one instance of software per client machine
first in Your myapplication.dpr write this code:
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program myProject; uses Forms, Windows, Dialogs, // other forms initialization... var Mutex: THandle; begin Mutex := CreateMutex (nil, True, 'Cashier2010'); if (Mutex = 0) or (GetLastError = ERROR_ALREADY_EXISTS) then begin ShowMessage ('Application is active'); end else begin Application.Initialize; ..//create form and run end; end. |