ftp over ssl on RH 4 and 5

[Yard, John]

I am investigating using vsftpd 
for ftp over ssl on RH 4 and 5.

I assume if I say ssl_enable=YES,
they I can have users , some of whom
use ftp over ssl , and others that use
standard npn - encrypted ftp.

Is this correct.

Assuming I have set up vsftpd to use ssl,
how does this affect setup of users who 
want to use ssl ? Where is this documented ?
( I am unable to find this documentation ).

JYard
UCLA