Words which launch processes can take either a command line string, a sequence of command line arguments, or a process
Strings and string arrays are wrapped in a new empty process
with the command
slot set. This covers basic use-cases where no launch parameters need to be set.
instance can be created directly and passed to launching words for more control. It must be a fresh instance which has never been spawned before. To spawn a process several times from the same descriptor, clone
the descriptor first.