It is possible to have multiple people logged into CommuSoft at the same time using separate usernames. We have clients with hundreds of users that login at the same time. There is no limit to the number of users that can simultaneously login as long as you have created separate usernames for each user.
However, you cannot login at the same time on two separate devices (PC/Mac/Mobile). For example you and a colleague cannot be logged in with your username on two machines at the same time. The system will log you out.