Questions: code navigation, -search, -highlighting

Hello,

1. When using 'Ctrl + I' to go to a definition, is there a handy way / shortcut to go back? It jumps around in a file, opens another file and I want to go to the caller of the particular variable / function.
2. Is there a history of search results? I use the search quite often but sometimes I want to search withing a block of code that I found in the current search. When I do that, the current search results disappear.
3. Are there Add-ins for CVI that allow some better code highlighting? E.g. different colors for datatypes, macros, functions, passing parameters, globals, pointers etc, or if a variable is selected and all usages of this variable are highlighted withing the current block. At least in Visual Studio this improves the readability greatly.

Thanks!