It's easy - just select the desired access level, copy this link and send it via email, instant message, etc.Link: Just a link to your wiki. Post this anywhere and people can ask you for the invite key.
E.g. in cygwin.bat:
@echo off
set path=.;C:\cygwin\bin;C:\_peterga\bin;.;%PATH%
set home=C:\_peterga
set bin=C:\_peterga\bin
set cygwin=C:\cygwin
set PS1=Cygwin:
set PS2= :
sh.exe