[Zope] ZServer threads and pool-size question

Hi, Can anyone tell me why, by default in a zope instance config file, the connection pool size is 7 while the number of zserver threads is 4? Why not 4 and 4? Thanks. Pascal ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com **********************************************************************