objective-c-terminology.m

// Method Signature
//
- (BOOL)searchFor:(NSString *)string
                  direction:(BOOL)forward
                  caseSensitive:(BOOL)caseFlag
                  wrap:(BOOL)wrapFlag

// Selector (Method Name)
//
searchFor:direction:caseSenstitive:wrap

// Keywords
//
searchFor:
direction:
caseSensitive:
wrap:

// Message (Method Call)
//
[myWebView searchFor:myString direction:YES caseSensitive:NO wrap:YES]

// Run-time Equivalent
//
objc_msgSend(myWebView,
             searchFor:direction:caseSensitive:wrap:,
             myString, YES, NO, YES)