A mSL script is a program written in the mIRC scripting language (mSL). mSL is a dynamic-type, object-oriented, general-purpose programming language that is embedded in the mIRC and Adiirc IRC clients.
mSL scripts can be used to automate a wide variety of tasks on IRC, such as:
Greeting new users
And much more
mSL scripts are typically written in a text editor and then saved as a .