trigger function:

Trigger an external process and return it's process ID. If all the arguments are strings run a process with that list. The result is the process ID:

Examples:

• running: (trigger "echo", "hello", "world") will give: 5183

• running: (trigger "no such exec") will return nothing

• running: (trigger 23) will return nothing Because 23 is not a string

• running: (trigger "echo", 23) will return nothing Because 23 is not a string