Yes. The script is licensed per domain, so you can install the script multiple times on your domain. The other instances of the script can use a single database, or you can set up multiple databases is your hosting package supports it.
The software is written in a language called PHP. From the PHP website, www.php.net, PHP is defined as: "PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML." Php costs nothing, it is free. PHP 4.3.9 or better is recommended. A MySQL server is free to download from www.mysql.com (Although your hosting company would have it already installed). The script supports MySQL 3 and MySQL 5 GD Graphics library is a piece of software which is used in conjunction with PHP to give PHP the ability to work with graphics. GD Library 2.0.28 or better is recommended. In most cases, these things are already installed for you when you sign up for a hosting service. Linux based hosting service is recommended, although the script will work equally well on a Windows based server if the requirements are met.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; If not, see http://www.gnu.org/licenses/gpl-3.0.html.
Yes, you can. The API is undocumented, however descriptive identifiers are used for function names, table names and variables. The code has been broken down into modules and functions, which means integration would be possible. The passwords are stored using the standard MD5 hash. Standard PHP sessions are used for the login, and the login code is in a function. Please note that the script source code is under copyright, and remains under copyright when integrated with 3rd party software. Our license does not grant the rights to sale or distribution of the copyrighted software, either in its entirety or modified form.
After payment, you will receive an automated email from our server. The email will contain a link and login information to the download section. You can then download the script to your hard disk. When downloading with IE, please choose the 'Save to Disk' rather than 'Open from Location' option. The file is a standard zip file, and you will need a program such as WinZip or WinRar to uncompress the zip file. After that, you may also burn the zip file onto a CD to keep a backup for yourself. Please issue a support ticket if you did not receive the automated email from us. Please include your full name and transaction details in the support ticket.