For the LPC11U37 - ARM Stamp and LPC1114 the LED is connected to P0(1).
IO(1) = X and 1 ' IO() sets pin direction and state
For the SuperPRO and PROplus. Use the following. LED is connected to P2(10).
' port 2 starts at 64
IO(64+10) = X and 1
To stop a running program simply press the Stop button.