AdiIRC

One of the features that mIRC contains yet AdiIRC lacks is the /play function. It allows users to "play" the contents of a text file to one or more channels/users. The play function can also be used to execute an array of commands stored as a text file. The numerous amount of options offered ensures that this command can be used to carry out tasks in a multitude of ways.

Now while this may seem like an unused function, I can tell you that some IRC networks use the /play command in official help channels during training or teaching sessions. Other channels also use /play as a way of issuing help documentation in real-time. This function is immensely useful for such environments.

Recreating this function into AdiIRC might take a little work, and should probably be similar to mIRC's implementation.