After logging into the system, you will see a red notification in the account window:

"We have detected that you are using the same account on multiple devices simultaneously – this violates the following Site.pro Terms of Use:

• 1.1 Use Site.pro under the conditions specified in these Terms.
• 2.1 Do not disclose your Site.pro login details to third parties.
• 5.1 The user is responsible for keeping their Site.pro login credentials confidential. If a third party accesses Site.pro using the user's credentials, the Site.pro administration considers this person as the User and does not take responsibility for any information leakage or consequences.

Please add an additional user to the company and assign an appropriate plan – this will allow each person to use the system individually. If you are an accounting company, we recommend inquiring about switching to the Partner plan."

This message informs you that your account is already active on another device, so you will be automatically logged out from one of the devices. If you are only using one device and still see this message, we strongly recommend changing your password immediately.