From: "Nuno Meireles" <nuno dot meireles at cm dash penela dot pt>

Please stop with the carriage returns.  It makes reading your e-mail 
unnecessarily hard.

> Does annybody nows where i can find a guide to install monowall on a PIII
> 867MHZ.

Same as any other PC.  I have it on about 20 at exactly that speed.

> I try to buid a firewall with:
> Proxy tranparente  to several clients (50 clients)

Not built in, but can redirect to a squid box transparently.

> Block Internet to a 21 clients
> Restrict Access to Internet (some URL,MSN,etc)
> Block some ports, etc, etc

Yes, yes, yes...

> Please someone help-me

Help you what?  So far you have not described a problem.  Perhaps this would 
help? http://doc.m0n0.ch/handbook/

                                Lee