[Velocd]

VeloCD, you can imagine that adding the topic would be a huge stumbling block for URL length. A topic like this (from "A Fish Called Wanda"):
"It's k-k-k-Ken and he's c-c-c-coming to k-k-k-kill me!"

would expand to something like:
%26It's%20k-k-k-Ken%20and%20he%25s%20c-c-c-coming%20to%20k-k-k-kill%20me!%26

My coding in mIRC is very limited, and I'm not familar with the functions used there unlike PHP, but if you could somehow use a function similar to serialize() and unserialize(), you could convert the long and lengthy strings into byte-stream representations.

Maybe there is a related function in the C language iRC uses that is similar to serialize?