There are no streams in the traditional sense.  The cmd line output gets sent to 
the cursor location of a document being edited and by using cursor keys, text 
can be injected all over the document.  Sprites can be injected and are not 
serialized!  Furthermore, the input can come from triggering macro widgets.  See 
Doc Overview and Doc Routines.

If you had a remote term and sent key Scan Codes, the user would press <CTRL-m> 
to access his Personal Menu to trigger his macros.  However, the local 
~/PersonalMenu.DD might differ from the remote, causing loss of sync between 
local and remote sessions.  Also, the window size of local and remote might 
differ, so word-wrapped text would be different.  Injecting output text with 
different windows sizes would cause remote and local documents to not be in 
sync.

See Char Overview and Char Routines.

You can send characters into StdIn.  See In(), XTalk() and InFile.