How the header is created, and when, depends on whether the software is new or already exists.

At that time parallel software only existed in very specialized areas.

The software has existed since at least mid-2003, with several different versions of the disc having been developed.

Most chess-playing programs can also be used for this purpose, but some special-purpose software exists.

Although such software had existed prior to 9/11, after 2001 there was a significant increase in focus on emergency management.

No such software exists in the distribution, and they have since revised their documentation to remove all mention of it.

Online software exists to manage shopping lists from cellphone as well the web.

Atwood's luck was to have the idea "at the same time as the software existed.

Powerful software exists which can greatly simplify the task of implementing and using computer systems.

However, other software exists which can save the streams to files for later viewing.