vB equivalent of javascript alert()?

[makaiguy]

For debugging purposes of new code, I'd like to pop up the equivalent of a javascript alert() box with appropriate wording at various spots in the code to be able to check progress and display variable values as the code is executed. Does vB have an equivalent function?

[Code Monkey]

echo ?

[makaiguy]

I finally just ended up writing my routine as a separate php page, peppered with all the print() statements I could desire. When I got it all working, I extracted the code sans print() calls and used it as a plug-in.