Using an external diff tools

Hi there,

Can i campare a local project file and a file in the internet?

for example say i have a file called wp-load.php in my prject and i want to compare that with this file in the internet

Can you provide me with some tutorials/example on how to configure external tools / external diff tools?

Ideally my usecase is when i am working on the local project file (wp-load.php) i want a short cut
( * when right clicking the file or
  * via Tools >
that will show the differences of the local file and the file in the internet via the diff viewer or maybe highlighted green lines (like when we checkout the project wiht svn)

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