How to enable the logs on MySQL 3.x?

Hi there,

I am trying to enable two things:

1. Slow query log
2. Error log

Despite the fact that I have enabled slow query log in my.cnf and the
-var command says it is enabled the file is not existing.
So I was searching for the error log, but there is none? :-(

Can somebody please help me with some hints how to enable both of the
log files?

thank you for any help,

merlin