Querying for employees

I am attempting to find the number employees in the System using RFC's and cant use BAPI_EMPLOYEE_GETDATA. Below are a list of RFC's which I believe may help me accomplish this, Is my assumption correct??

If its is I cannot seem to get the RFC's To work because I dont know the approriate syntax for populating the FUNCAREA field and SELID field. Can some one provide the syntax and sample of how to populate these RFC's

HR_CREATE_QUERY_FOR_INFO_GET

HR_INFO_GET

HR_INFO_GET_USING_QUERY

Greatly appreciate Your help,

SAP Newbie