In earlier releases, the Online Help in the Classic Client did contain two separate sections:
•Microsoft Dynamics NAV Classic Help
•C/SIDE Reference Guide
In a non English country release, that would mean that end users had to deal with two languages in one application. The Microsoft Dynamics NAV Classic Help would show up in the language of the country release they were working with and the C/SIDE Reference guide would always show up in English. The expectations were that end users would not start the C/SIDE Reference guide.