A question about hosts files

[EleGoS]

Hi there!

I'm super-happy because I've just finished my semi-auto configurator for 
Windows machines ^^

I've got a question: must all the users of a VPN share all together 
their hosts files?

i.e.

PC1 is linked to PC2 -> PC1 and PC2 must have both /hosts/PC1 and hosts/PC2
PC2 is linked to PC3 -> PC2 and PC3 must have both /hosts/PC2 and /hosts/PC3

Must PC3 have /hosts/PC1 and PC1 have /hosts/PC3?

Thanks :D