Icons in the list (globe or folder) offer many options (click, right-clik, ctrl-click, ctrl-shift-click)
There are two types of icons
a. globe icon. It indicates that the reference has a weblink. If the reference was fetched from pubmed, then this will link to the reference of pubmed website. It there is no PMID, but a webite reference in the 'notes' section, then this will link to that website.
b. folder icon- indicates that there is pdf file in the reference folder associated with this reference.
c. These icons can be turned on/off by the (1) icon on the toolbar. The software automatically looks in the reference subfolder to find pdf files associated with the reference. Also looks for PMID or website address to generate the globe icon