Create an html containing a form whose action is set to the fully qualified name of the service that you want to invoke. In the html form, use the same name for the input text tags as the inputs of your flow service.
Eg if you have a service TestService in a folder called TestFolder. In addition, lets also assume that your service takes two input parameters -> firstName and lastName, here’s a snippet of how your html code should look like:
When the submit is clicked, the TestService is invoked with the inputs firstName and lastName. When the service completes execution, the output template defined in the TestService will be used to display the results in the browser. If there is no output template defined in the TestService the default template (the webMethods IS gray template) will be used.
I would recommend reading DSPandTemplatesDevGuide.pdf in the /Developer/doc/guides folder (that’s where it is in the 6.1 version). Hope this helps.
Edit - missed out the invoke in the action URL