can sagecloud open many windows like sagenb?

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There are a few options depending on what you need.

1) You can open several projects and within those, several worksheets all at the same time. However, you will only see one worksheet on the screen at the time. The others will be open and are shown in tabs that are organized by the projects.

2) You can open more than one browser window and log into SMC from all of those at one time.