The top-right of the screen provides a search-form. The search string 
typed is searched as a substring and case-insensitive. Multiple strings 
separated by spaces search for the intersection. Searching for objects 
that do not contain a string is written as <string>. 
A search for adjacent strings is specified as -"<string>". 
Here are some examples:
load file | Searches for all objects with the 
strings
load and file.  | 
load -file | Searches for objects with load, 
but
without file.  | 
"load file" | Searches for the string load 
file. | 
The two radio-buttons below the search box can be used to limit the search. All searches both the application and manuals. Searching for Summary also implies Name.