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Is it possible to create a user defined dialogue in a sub-routine enabling the input of variable values? For example, I want to obtain forecast values based on different values of an independent variable(s). Thanks.

Yes. Lookup @uidialog, or see some of the later posts here:
http://forums.eviews.com/viewtopic.php?f=5&t=1638

Many thanks for the prompt reply. Presumably I would use a scalar input? Do yo have a two-line example where I enter, say, a value equal to 8?

I have tried the following and get a value of 0.0000 in the variable value1, irrespectve of what value I enter:
%value1 = ""
scalar value1= @uiedit(%value1,"Enter a value")

Thanks.