When added to a stack, a marker inserts a constant 16 bit unsigned value in the outupt data produced by the VM-USB in response to that stack's trigger.
The uint16 unsigned 16 bit bit integer will be inserted into the output stream. Defaults to 0
Note that if you want to place a 32 bit marker in the buffer, you can do this with two markers. Be sure to place the least significant 16 bits in the buffer first.