You type the command name and put (); around it, and inside the () you put arguments
For example
findclientbyname("Pacnet");
findclientbyname - command (function) name
"Pacnet" - Argument
(); - Syntax to use the function.
How to declare commands / functions :
function name(%arg1, %arg2, %etc)
{
//code here
}
name - function name
%arg1, %arg2, %etc - arguments, can be more than 3
{ and } - syntax