Instream commands are a type of sub-community that can be issued without exiting the current command. Instream commands adjust or alter the drawing environment so that another command works more efficiently. Instream commands allow you to reset a given parameter (or parameters) on the fly, so that you don’t have to waste time restarting a command.
For instance, while drawing a line you may need to magnify a specific area to attach a line to a previously drawn element. After issuing the command to insert a line, you can click on the instream command button, Zoom Window (“Zoom the drawing using a window”) to magnify the desired insertion point without reissuing or interrupting the line-draw command.
For a list of instream commands (and the explanations of what they do), press [F1] to open Help. In the Index, type “instream”, and follow the links.