How to make multi-disc installation

Hello there,
I'm a freshmen in NSIS, this question may seem stupid 🙂
I got to make a HUGE installer and distribute it in CD. It's about 900M in size and seems have to be seperated into 2 discs.
But I can't find any scripts to reach this, there is no argument with OutFile command.
What shall I do?

WOW, so fast, thank you.

Or you could use the CABSetup plug-in which was also developed for these types of installs.