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In this code: I would expect both test messages to display, but only "Test 2" displays. Why?
I am using Eviews 8 Enterprise edition, July 29 2014 built.
In fact, the "Command and Programming Reference" document on page 71 says @neqna("", "def") returns a 1, but the following code returns a 0:
scalar aTemp = @neqna("", "def")

@neqna only applies to numbers.

The documentation clearly states @neqna as a string function. Here are several examples from the Command and Programming Reference:

Page 543:
@neqna(str1, str2) tests for inequality of strings

Page 567:
@neqna ................tests for inequality of string values treating empty strings as ordinary
blank values (p. 579).

Page 579:
@neqna String Functions
Syntax: @neqna(str1, str2)
Argument 1: string, str1
Argument 2: string, str2
Return: integer
Tests for inequality of str1 and str2, treating null strings as ordinary blank strings, and not
as missing values. Strings which test as equal return a 0, and 1 otherwise.
Example:
@neqna("abc", "abc")
returns a 0, while
@neqna("", "def")
returns a 1.

You're right. I was half asleep.

Looks like the function doesn't handle empty strings properly.