./ stands for Dynamic Data Exchange, an older Microsoft protocol for inter-process communication. This is a Windows-specific feature.
One of the most common uses of DDE is to open a file double-clicked on in Windows Explorer in a currently running instance of an application. Indeed, this is why it was implemented in modo in the first place. But DDE also allows for more arbitrary functionality.
‘’modo’’’s implementation of DDE allows other applications to send it commands to be executed. Only executions are allowed; queries are not supported.
Connecting (aka “starting a conversation”) through DDE is done by specifying the name of the application (server) and the topic targeted. For ‘’modo’’, the application name is modo and the topic is ‘’’system’’’.
Clients can ask modo to open a file or execute an arbitrary command. The request name may be optionally wrapped in square braces, as per the DDE specification.
Open a scene file into modo. This was implemented primarily for Windows Explorer. The parentheses and quotes wrapping the filename are required.
Although connections and disconnections are allowed at any time, executing other requests will only work when the user is idle. “Idle” is defined as no modal dialogs are open, no mouse buttons or keys are down, and no commands are currently executing. If the user is not idle, DDE_FBUSY is returned to suggest that you should try again later.
If the data exceeds the available buffer size, DDE_FNOTPROCESSED is returned. The buffer is currently set to 2K. This error is also used to indicate an unrecognized request.
If everything went well, DDE_FACK is returned.
[http://en.wikipedia.org/wiki/Dynamic_Data_Exchange Dynamic Data Exchange], a short overview on Wikipedia
Microsoft’s [http://msdn.microsoft.com/en-us/library/ms648774.aspx About Dynamic Data Exchange] page explaining DDE in detail