An Include Procedure cannot be executed directly, the contents of its source code can only be Included into other Procedures using the Include command.
Although it is possible to have an Include simply dump a block of source code lines into the middle of another Procedure, that is not recommended. Include Procedures should only be used to share Constants, Macros, and Private Methods among other Procedures.
Include Procedures do not make use of the Group Type security themselves. Since Include Procedures are included into other Procedures the Group Types security of each Procedure that uses the Include is applied.