System Workbench for STM32

Hi,

Yes, if you have another stlink (v2 or v2-1), you can use it to debug the STM32F100RB on the STM32VL-disco.
But you should disconnect the STLink V1 in that case and supply the mcu.
So, you should review the stlink v1 schematic to have a proper hw config to do this.
The Disco board is not a Nucleo where you can break the Stlink part or disconnect the Stlink via jumpers/solder bridges.

Laurent