Click

on the toolbar; or, from the
File menu, select
Save; or press
Ctrl+S.
The file associated with the current frame (right side of the screen) will be saved. If that file belongs to an application that is open, the entire application will be saved. If the file belongs to more than one application, CSPro will ask you which one you want to save. In that case, select the file or files you wish to close or save and click on OK.
To choose all of the files, click on the Select All button. To choose several files, hold down the Ctrl key and click on files you wish to select.