I have so many versions of this topic that I now am certain that most of the answers provided are wrong. Since you cannot have so many ways of connecting an external nrf device to the nrf51 DK.
My objective like many others is to connect a SEPERATE nRF51822 module to the nRF51 DK, what is the connection diagram?
Secondly from what I have understood:
If using Keil, you build and then click the Load button to program the nRF51 DK or nRF51822 (if connected)?
If using embed, you build, compile, and then click and drag the .hex file into the J-Link folder to program the nRF51 DK or nRF51822 (if connected)?
Thirdly I know there is Keil, GCC, mbed, and IAR. Are there any more and which is the easiest to use?