Dynamic URLs
From IShell Wiki
Dynamic URL Substitution refers to URLs dependent on Global Variables. For projects in which media are switched in and out based on variables, this feature simplifies coding immensely.
Use the syntax <-globalvar->, where globalvar is the name of the global variable.
For example, if the URL bar reads album<-albumnumber->.jpg and global variable albumnumber is defined as 1, Runtime will display the graphic album1.jpg.
When entering a dynamic URL in the editor into an Element iShell will show the Yellow indicator. This is saying this URL may or may not work depending on what happens at runtime.

