specified using the fuzzy form detection process produces the result wherein the submitted form uses the dynamic form field value for u201c sid u201d 853 from the document the missing form field u201c action u201d from the previously downloaded web page is compared to form field u201c action u201d 862 from the form to be submitted the form merging instruction 802 u201c add form field use script value u201d specified using the fuzzy form detection process produces the result wherein the submitted form contains the form field u201c action u201d 863 and uses the form field value u201c add to basket u201d from the script with a replay engine capable of form merging it is possible to model web page transitions by a context full replay instruction in situations where this would not be possible with a prior replay engine examples for such situations are web application which embed incomplete forms within html documents and modify these forms by means of client side code execution e g javascript prior to submitting such a form form modifications performed by client side code may be adding form fields removing form fields renaming form fields or changing values of foam fields the present invention includes a recorder that can choose suitable parser additions from a library of available parser additions that are needed for generating context full replay instructions the recorder of the present invention also performs fuzzy form detection the input of the recorder 1101 is a sequence of http transactions as shown in fig9 each http transaction is either a simple http transaction 901 or a compound http transaction 902 a simple http transaction.