If you want to block access to the system for some users, you can do in the Users module. Go to the admin panel by clicking a "Software configuration" button and select "Permissions" and "Users".
Cron is a Unix daemon that triggers other programs periodically. It uses crontabs to save information about cron tasks that will be enabled. It is recommended to use it in Linux, but if the same file will be added to the scheduler in Windows, it will also work. In practice, YetiForce can perform certain tasks automatically with cron and trigger them in the background.
YetiForce CRM requires a proper web server configuration. It is a key element for the process of installation as well as for the system to be stable. Most professional web servers meet the requirements presented below. However, in case your server does not meet all the requirements, ask your administrator to adjust the configuration and send him a link to this article. If your administator cannot change the configuration, it might be time to consider upgrading your server.