Get Event Mask - SENDMSG() Function 21
                                            Syntax
EMASK$=SENDMSG(sysgui,id,21,0,$$)
Description
This version of the SENDMSG() function returns a four-byte string that contains the event mask of the id-specified window or child window.
| 
                                                             Parameter  | 
                                                        
                                                             Description  | 
                                                    
|---|---|
| 
                                                             sysgui  | 
                                                        
                                                             Valid SYSGUI channel.  | 
                                                    
| 
                                                             id  | 
                                                        
                                                             Child window ID, or if 0 is used, the current window.  | 
                                                    
| 
                                                             21  | 
                                                        
                                                             SENDMSG function number  | 
                                                    
| 
                                                             0  | 
                                                        
                                                             Always 0.  | 
                                                    
| 
                                                             $$  | 
                                                        
                                                             Always null.  |