How to write 3ds max scripts and plugins?

[hye bin y]

What am i going to do with

Macroscript PolyAttachMultiple
Category: "TJ_Modeling"
Tooltip: "Poly Attach Multiple"

(
undo on
(
selectionArray = selection as array;
for obj in selectionArray do
(
convertTo obj PolyMeshObject
)
try
(
for i = 1 to (selectionArray.count - 1) do
polyOp.attach selectionArray[selectionArray.count] selectionArray;
)
catch(print "you have attempted to attach incompatible objects")
)
)

Where should i copy and paste this.