[Beowulf] quick and dirty method for starting job on another node?

[Jim Lux]

I'm looking for a quick and dirty way for a process on node N to start a
process on Node M, without having MPI, etc. running.  Needs to be a single
line for use in, e.g. a script. SSH is available on the target nodes, but
not a whole lot else. The nodes are using "busybox" for all the shell kinds
of things.

Performance isn't critical.