The ESL DDE DLL comes with an include file (ESLDDE.INC) that contains:

•declarations of all DDE functions and subroutines

•constant definitions for all eventnumber values

•constant definition for format

Additionally, since many of the DDE functions require a status parameter that is used as part of the DDE protocol, ESLDDE.INC contains:

•constant definitions for status values

•declarations for two functions used to compose and decompose status values