Check statement, checks the condition with in a loop and if it satisfies the condition, the control moves to next statement in the loop. Otherwise, it terminates the loop. Continue statement, acts like goto statement. If the condition is true, it processes the remaining statements and if the condition is false, then the control moves to the top of loop. At-Line selection, At user-command etc.., In at line-selection system defined fcode will be generated In at user-command we need to define the fcode and fkey manually then only it will triggers.