CAN I USE QUICKBOOKS IN 2 COMPUTERS AT THE SAME TIME

If you have the licenses for it, yes.

Hope this helps. If so please mark solved, if not please ask more questions. Thanks!

From the EULA ---

A QuickBooks license determines the number of individuals who can use QuickBooks.

Multi-user access to QuickBooks allows individuals to work in QuickBooks company files at the same time. For multi-user access to company files in QuickBooks Pro or Premier, you can either purchase more than one single-user license or a multi-user license. QuickBooks Pro offers a 3-user license and QuickBooks Premier offers a 5-user license. A maximum of five users can use a company file at the same time.

If you have more than five users who need to use QuickBooks at the same time, QuickBooks Enterprise Solutions (QBES) offers a 5-user, 10-user, 15-user, or 20-user Value Pack license. Additional 5-user seats can be added to increase the number of users simultaneously accessing a QBES data file (up to a maximum of 20). These seats are available only in increments of five users. New seats are installed using the same license and product number used for the original installation.

If you would like to add another user license to your existing QuickBooks Pro or Premier license, you can do so right in QuickBooks. Go to the Help menu, click Manage My License, and then click Buy additional user license.

Note: The option to buy an additional license is not available on QuickBooks Premier 5-pack license installations.

Single-user licenses
If you purchased a single-user license of QuickBooks, you can use QuickBooks on the computers used by a single individual.

Example:

If you use QuickBooks at the office but also need to use QuickBooks on your home computer or laptop, a single-user license allows you to install QuickBooks on each of the computers you, the individual, use.