I suppose you could say sequential execution, yes.  The short script sample I posted would automate the sequential running of multiple scripts.  It sort of reads to me like perhaps you have a different problem than I thought, however.  What exactly do you want, when you ask about two scripts running together?  One script can run another script, as I showed.  You're trying to manaully run two or more scripts at the same time, perhaps?

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.