@acer Thank you very much for your help.  It took some fooling around and false starts on my part but I have the library created and working.  It is exactly what I hoped for.  I did not change the way I defined the functions or use GENARGS since it looks like that was only for cross platform compatibility and I'm limited to windows.

I haven't tried the less sophisticed way you mentioned (though I may yet) but I think that would recreate all the functions each time I executed it and clutter up worksheets with a bunch of defintions.

Anyway, thank you again for your help

Thank you @dharr and @Kitonum I think I see, I defined my system as a list using square brackets and sys1[] inserts the contents of the list while the curly brackets group my equations and initial conditions into a set, do I have that right?  Playing around with it if I define sys1 as a set or list containing both equations and the the initial conditions I see dsolve(sys1, type = numeric) works.  It's painful but I'm slowly learning

vv 12330, thank you so much.  I'm ashamed that it's taken me five years to say that but I think this is the first time since then that i've been back.  my need at that time was cancelled by my management's request to stop working on it.  Anyway I'm back now with a similar problem and I think your answer may point the way.  -tom

@tomleslie rhs works beautifully.  I had tried op(2,solution) but that didn't work in conjunction with plot.  I'll try to upload the actual sheet next time I need help so thanks for that tip too.