Besides the proper command, Desktops. OpenDoc, the command Desktops. This additional information is a parameter for the command Desktops. Some commands allow for a list of several parameters. For commands using a list of variable length, Oberon needs a hint marking the end of this list.
Commands can use the current selection as input area using only the selected section.
Commands can also redirect the input to begin at the selection, starting there but continuing possibly beyond the selected range. There is no unified convention for this. To safeguard against unwanted risks, in particular for critical commands like file deletion, the end of the parameter list should always be marked as discussed above, in particular if redirection to current selections is used. This convention is only implemented in a few commands. This is commonly used as an alternative to using the name of the viewer.