Alfredo,
> 
> is there anyway to print smart tickets to access to the captive portal in Monowall?(like in
hotels, cybers, coffeshops...). If somebody is developing it, i would like to help.

Here is a posting: http://forum.m0n0.ch/index.php/topic,127.0.html

This extensions has the following functions:
a)
It extends M0N0 to print codes (one time passwords) in CSV format, which
 you can import into a spreadsheet. Either print it out directly or use
Document editing Program to create formatted outputs of the vouchers.
This codes are used in conjunction with the captive portal.

b)
Walled Garden Functions:
You can also define URL's which can be accessed without authentication.

regards
Jakob