Everyone in the company is working in HTML which is a very simple mark-up code used for formatting static web pages. However the programming code featured on the computer monitors is the programming language C++ which is what company would be using for dynamic web applications.
The movie is set in 1999, but everyone has LCD monitors. LCD monitors weren't popular until the mid 2000's, and they didn't start outselling CRT monitors until 2007.
Y2K happened Jan 1, 2000 and the hardwood trees outside at with all their leaves.