Hotkeys

Hotkey	Action
Navigational keys
Tab, Shift+Tab	Switch between controls
Ctrl+Tab, Ctrl+Shift+Tab	Switch between the tabs (Search, Replace, etc.)
Ctrl+1, Ctrl+2, etc.	Switch to the first, second, etc. tab
Alt+1	Move focus to the results pane
Alt+2	Move focus to the context viewer
Alt+S	Move focus to the "Search for" box (in English version)
Esc	Quit the program

Hotkeys for toggling search modes (in the English version)
Alt+C	Match case
Alt+H	Whole word search
Alt+R	Regular expressions

Hotkeys in the results pane
Up, Down, Page Up, Page Down, Home, End	Move the selection
Left, Right	Move to the previous/next file
Enter	Open the file in an external program
Alt+Enter, Alt+Double click	Open the Properties window
Space	Check/uncheck box
Insert	Check/uncheck box and move to the next occurrence
Ctrl+C	Copy the results to clipboard
Ctrl+Shift+C	Copy the results to clipboard (the matching text only)

Hotkeys in the context viewer
Up, Down, Page Up, Page Down, Home, End, Left, Right	Navigate in the file
Ctrl+Home, Ctrl+End	Go to the beginning or the end of the file
Ctrl+Page Up, Ctrl+Page Down	Go to the first or the last visible line
Ctrl+A	Select all
Ctrl+C, Ctrl+Insert	Copy selected text to clipboard

Sorting the results
Ctrl+F2	Sort by path (first by the directory, then by the file name)
Ctrl+F3	Sort by filename (regardless of the directory)
Ctrl+F4	Sort by extension
Ctrl+F5	Sort by modification date (recently changed files first)
Ctrl+F6	Sort by file size (the largest files first)

In non-English versions, press Alt + underlined character instead of the proposed shortcuts.

This is a page from Aba Search and Replace help file.