......when I open multiple spreadsheets in Excel 07, it opens (what appears
to be) an individual instance of Excel for each sheet that I open.

Is there a way to have ONLY ONE INSTANCE of Excel open for as many sheets as
I open (such that they are all accessible via the first instance of the
program that I open)?

I've looked through all the option settings but nothing seems to address
this.

Please help, thanks!