What means shareware ?
A shareware is typically a software that you share.
However be sure to read the licence of this kind of software before you distribute it.
In fact a software is more a software that you can try for free during
a limited time or a free software with some disabled functions.
To get a better software distribution, a software should be usefull
in is unregistred shareware version and more usefull in is registred shreware version.
I have a good english website that explains the concept
of shareware in english : here
in french you can watch this one:
sharedif