On the fly
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In relation to computer technology, on the fly describes activities that develop or occur dynamically rather than as the result of something that is statically predefined.
For example, the content of a page that is sent to the user from a Web site can be developed (and varied) "on the fly" based on dynamic factors such as the time of day, what pages the user has looked at previously, and specific user input.
As an example of the latter, user input may be a search item; it would not be practicle to store all possible result pages, although the database may be indexed to make the search faster.
The Web server calls a program to produce the "on-the-fly" page that is to be returned. There are several techniques for on-the-fly page development, including the server side include, the use of cookies (information previously stored about you that is located in a special file on your hard disk), Microsoft's Active Server Pages, and PHP.
A page created on the fly may or may not have its own URL, containing all data on which the page depends.
In colloquial use, it means at the moment.