char                 inVirtualKey,    
                         XPLMKeyFlags         inFlags,    
                         const char *         inDescription,    
                         XPLMHotKey_f         inCallback,    
                         void *               inRefcon);    

This routine registers a hot key. You specify your preferred key stroke virtual key/flag combination, a description of what your callback does (so other plug-ins can describe the plug-in to the user for remapping) and a callback function and opaque pointer to pass in). A new hot key ID is returned. During execution, the actual key associated with your hot key may change, but you are insulated from this.