[Serusers] Easy Questions

[Tim Garey]

Hi,

My programming skills are limited but I do have some experience and am able 
to
use SER scripts and change them with success. However I sometimes need
to ask some questuions to further my trip into the SER world.

1. I'd like to know what the following expression means?

           if (!t_relay()) {
                 sl_reply_error();
          };

2. What is a Realm?

Thanks

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