Make sure java is installed and enabled.
Problems (applet doesn't load at all, no sound, unable to copy text, laggy)
be solved by using a different browser. Alternatively using
instead of a browser would solve almost all problems.
Solution to copy-paste in java applets:
Main buttons in most models SETUP and GO. Code (.nlogo file) can be downloaded and explored in detail with using netlogo.
Descriptions for models might be inaccurate or incorrect. Explore the code in netlogo for full details.