ah.. did you mean to say that my program will restart **whenever ** a serial Monitor or similar program is opened.
Yes, the opening of a serial monitor or terminal program will activate the DTR control signal, which the Arduino design has wired to the reset pin via a series capacitor. There are a couple of ways to modifiy the board to prevent this action but unless easily undone it can make uploading new sketches difficult as activating the Arduino reset is how the Arduino IDE forces the Arduino to activate the bootloader program on the AVR chip.
And yes, the Seeduino clone design has a switch to activate or deactivate this feature, as well as a switch to force power selection from the USB or external voltage source, also handy at times.
Lefty.