DDE Terminology
In DDE, the screen is called the presentation space (PS). When copying information to or from the PS, the indices used always begin at 1 and end at the last value of the PS. For example, a 24x80 screen has 1920 addressable positions, which range from 1 to 1920.
Some of the requests return multiple items back to you in a single string. Each item is delimited using the carriage return byte (“\r” in standard C syntax), value 0x0D, or 13 decimal.
DDE lets you start a conversation with:
