The application allows access to multiple users simultaneously. You can assign your coworkers different roles to reflect their responsibilities in the team. You can find more about roles here.
The amount of users you can invite to your account is dependant upon your pricing plan.
What is useful when co-working on Prowly account is the Story Ready status. By means of setting up the ready status you can let other team members know that this pubication is ready and can be e.g. published or undergo an approval.