How many windows can open at the same time on one computer?

This mainly depends on paid package type and computer configuration.
For example, if you purchase a solo package, you can open 200 windows at the same time. It also depends on your own computer configuration. The higher the configuration, the more browsers you can open.
If computer configuration is low and impossible to open such many browsers at the same time, users can log in to sub-accounts on other computers. Gift sub-accounts are contained in the paid packages.