Make the field in your search layout global fields.
In a script you attach to a button in this layout (which you display in the separate window):
Close window [current window] //closes the floating window
Enter find mode 
Set Field [yourtable::fld1 ; yourtable::globalfld1]
Set Field [yourtable::fld2 ; yourtable::globalfld2]
# etc for each field
Set error capture [on]
Perform find 
Set error capture [off]
You're on FileMaker's payroll for all this work you do... right?
I only get paid in "Kudos" and the satisfaction I get when my suggestions help someone out.