All the major definition constructs in MAXScript (such as utility, rollout, macroScript, rcmenu, tool, plug-in, etc.) can now include global variable declarations at the top-level within them.
rollout foo "foo"
local a, b = undefined, c
global d, e = 3 -- now possible
spinner bar "Bar"
checkBox baz "Baz: "
on bar changed do ...
In releases prior 3ds Max 4, globals had to be declared inside on-handler bodies. Any initializers present in a global declaration like this are at compile time, so the initial value expressions must be executable at the time the script is compiled.
Scope of Variables