How do I deal with the POST form

[operaminix]

I have a \[code\]POST\[/code\] form where of course there is things in it that you need to submit. when I submit it I usually submit them to another file for example \[code\]action.php\[/code\]. Now here is my question: after submitting the file and after all the operations that user wanted are done how do you usually deal with the situation? do you redirect back to the previous page? if so, how can you show that the operation the user wanted are executed and there is no error?to be more specific look at the following code:\[code\]if ($_POST['something']) {$doeverythingif $doeverything {what do you usually put here? how can I show a message here, in the same time, I am back to the previous page where I submitted my information in.}\[/code\]how can I assign an error after redirecting back?