windows in a load bearing wall

We want to install two large picture windows in a load bearing wall. We are comfortable that we can build the frames with sufficient headers and stuctural integrity to cope with the weight that bears down on the wall - however - we are concerned that will a span of 6' each that there may be additional structural requirements to insure that section of the exterior wall stay tied into the roof and joists. our concern it that the new wall with the new windows would have a tendency to fall away from the structure? Any hints, advise, concerns, or insite?