Many thanks to Chris Pollach for pointing me in the right direction.  Turns out, the PrintOpen("name", true) function does not change the default printer.  Hooray, made my job much easier!

Here's my code, in case your curious:

// Override
long ll_rc
ulong ul_job

this.Retrieve(il_FormID)
if this.RowCount() < 1 then
	MessageBox("Legacy Label", "No data retrieved")
	return 0
end if

// Open a print job.
ul_job = PrintOpen( "Cal Label", TRUE )
if ul_job = -1 then
	MessageBox("Legacy Label", "Print Cancelled")
end if

// Send the Start Label sequence.
Print( ul_job, "##startlabel##~r~n" )

   ... print a lot of fields ...

// Send the End Label sequence.
Print( ul_job, "##endlabel##~r~n" )

// Send the job to the printer or spooler.
ll_rc = PrintClose( ul_job )

return 1

This is so much simpler than how I was trying to do it.  I was just trying to get old code to work.  Again, I'm very grateful, Chris!

~~~Tracy