One of the features of RTMC Pro is the ability to embed hotspots inside the project. These hotspots can be embedded with an HTML link within the project and allow the project to specify the value of the href attribute. For example, something similar to the following could be specified for the link attribute:
javascript:alert("This measurement is helpful for eddy covariance.")
If the user clicked on that hotspot, the browser would then show the content in an alert dialog.