How is Tiddlywiki possible?

[HopfZ]

Tiddlywiki has two impossible-looking feature:

1. modifying itself.
2. creating a backup of itself.

How can javascript do these?

I've look at its code, but it's really complicated.

[Nick Gerber]

Hi

I'm a huge fan of tiddlywiki. And the answer to your questions is as
simple as tiddlywiki itself:

in Mozilla: XPConnect
in IE: ActiveX
or Java.

The Trick is, that all these techniques require local file access
rights. This rights are granted if tiddlywiki is startet locally with
file://.

Nick
HopfZ wrote:

Tiddlywiki has two impossible-looking feature:

1. modifying itself.
2. creating a backup of itself.

How can javascript do these?

I've look at its code, but it's really complicated.