how to build library in Dynamic C
This section of the documentation explains the Dynamic C “.LIB” files:
http://ftp1.digi.com/support/documentation/html/DynCUsersManual/4lang.htm#1029144
If you want to make use of a library in your program, you add a “#use” directive:
#use “mylibrary.lib”
Let me know if you have further questions after reading my answer and that section of the manual.