$cons->GenerateCtrlEvent([type,processgroup])
Sends a break signal of the specified type to the specified process group.
type can be one of CTRL_BREAK_EVENT or CTRL_C_EVENT,
signaling, respectively, the pressing of CTRL + Break and of CTRL + C. If not
specified, type defaults to CTRL_C_EVENT.
processgroup is the PID of a process sharing the same console. If omitted,
it defaults to 0 (the current process), which is also the only meaningful
value that you can pass to this function.
Returns undef on error, a nonzero value on success.