Any number of users can simultaneously access VSys, subject to the number of licenses you've purchased.
See Also
Q & A
Is VSys One Windows- or web-based?
What are the hardware requirements?
What are the database server requirements?
Do we need the software loaded onto every computer?
How can we import our existing data?
What language is VSys One developed in?
Is it open source, and can we add or modify existing features?
Does the database reside on your server or ours, and who is responsible for maintaining it?
How does VSys Web work?
How does VSys Live work?
Is the database encrypted?
What do you recommend for the kiosk interface?