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Now keil says
In-System Programming means that the device can be programmed in the circuit by using an utility such as the ULINK USB-JTAG Adapter.
In-Application Programming means that the application itself can re-program the on-chip Flash ROM.
Also UM10524 says
In-System programming (ISP) is programming or reprogramming the on-chip flash memory, using the bootloader software and the UART serial port. This can be done when the part resides in the end-user board.
Does that mean ULINK interfaced with SDDIO & SWCLK pins, access bootloader software & UART0 of the LPC then program the IC.
However I debug my code using USART0 with ULINK. It worked fine. No error. As by above statements ULINK will access UART) to program however I am using USARt0 to send code on PC terminal.
Or I misunderstood it.