hlsl static float4

I want to capture a value from the pixel shader and store it in a static variable then later recal the value in the pixel shader. But the debugger shows me that it simply ignores the following statements in the hlsl fx file: static float4 bounds; vsO vsMaster(vsI i) { vsO o; o.p0 = mul(i.p0, wvp); o.c0 = i.c0; o.t0 = i.t0; o.t1 = float2(i.p0.x, i.p0.y); bounds = i.c1; return o; } float4 psMaster(psI i) : COLOR { float4 d = bounds; float4 c = tex2D(samp, i.t0); c *= i.c0; return c; } how can a pass the data to the pixel shader without it interpolating the value. I am under the assumption that values passed to the pixel shader thru input and output registers are interpolated per pixel. Thanks, Devin