Bread-Bakers v100.n002.28

In response to Bonnie Pollack's inquiry to bread machine bread in an hour, 
I received an Oster bead Machnine for Christmas.  I made a loaf of White 
Bread using the expressbake feature (58 Minutes).  It came out very well, 
but, the only draw back I found was that having to use  five teaspoons of 
rapid rise yeast everytime way could get rather expensive.  which makes me 
think of this, Is instant bread machine yeast interchangeable with rapid 
rise yeast?