Hi!
I’ve been using InstantRails for some time now, but now it has become
necessary to run ruby scripts from places other than the InstantRails
console window.
Can i make ruby aviable system-wide without going the long way and
installing the ‘proper’ version over again? Like setting some
environment variables?
Thanks in advance 
Via InstantRails FAQ, located on
http://instantrails.rubyforge.org/wiki/wiki.pl?FAQ
A: Yes ! It can be a hassle to get all the right stuff going on rails,
instant rails makes it easy to have multiple rails versions. You can
always add /ruby/bin to your path, and start up rails apps as normal
too.
Simply adding ruby\bin to the Windows PATH does work, but doesn’t
provide a full Ruby development environment. It is missing the file
associations that invoke Ruby on .rb[w] files, does not have Windows
Start Menu entries for the SciTE editor and the FreeRIDE IDE, doesn’t
have the custom icons for .rb[w] files, and does not create the
RUBYOPT=rubygems environment variable needed to make rubygems part of
your system.
To rectify this, do the following:
Temporarily rename the directory …\InstantRails\ruby to something
else (like …\InstantRails\ruby-save).
Install the [One-Click Ruby Installer] at …\InstantRails\ruby.
Now that you’ve got all the nifty system mods, delete the directory …
\InstantRails\ruby and rename …\InstantRails\ruby-save back to its
original name.