dummy and interaction dummy

[lnp3]

dear forum:

I really need help on this issue. I am using Eviews 8.

1) do dummy variables enter co-integration and unit root tests?

2) do *interaction dummy* variables (d*gdp) enter co-integration and unit root tests?

3) Is it OK if I interact dummy and gdp in excel ( and export interacted data to eviews) rather than interacting them in Eviews?

thank you for your help.

all the best,

[mumpenhour]

Do you need help creating dummy variables,
or are you just asking how they function with certain operations with eviews?