When working with code it is often usefull to see - where current variable name or identifier is also used in file.
See attached example from eclipse.
The idea is to find current identifier - not current selected text.
User should no do anything to see same tokens just put a cursor on some of them.
For example - "|" - is cursor position
for var1 in list1:
This way current word is "var1". It will be quite usefull if all tokens with same value will be highlited
with background color or so. It helps to understend code better and eliminate missprints problems like: "va1".