8.3.5 The RexxQueryFunction() function This function retrieves the status of an external function handler. The prototype of the function is: APIRET APIENTRY RexxQueryFunction( PSZ FuncName ) ; The significance of the parameters is: [FuncName] Points to an ASCII NUL terminated character string which defines the name of the external function to be registered. This is the same name as the REXX interpreter uses with a function call or via the CALL command. The returned value from RexxQueryFunction() can be one of: [RXFUNC_OK] The external function handler was found. [RXFUNC_NOTREG] The handler was not found.