compare two files - or two open documents, or an open document and a file;
find in file or directory or directory and subdirectories - or in multiple open documents

Also:

Fully-customisable sytax highlighting (on-screen and in printouts);
Print multiple files;
reads uVision Projects (and others);
source browsing;
Hex display mode;
Can hide inactive #if...#endif sections;

... and many, many, more!