int sds_regapp (const char *appname);
Register extended entity data.
This function adds the application name to the drawing's list of registered applications. You can register as many applications as you like in each drawing.
The appname argument is the name of the application to be registered. This argument is limited to 32 characters.
This function returns RTNORM or an error code if the application is already registered
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Programming Overview of SDS (Solutions Development System)