Error code on extpgm?

Since I'm still a little new at this procedures stuff.  What is the 
correct way to get say an error code value to be returned?  Here's my 
current definition:

I was using this api this way:
     c*                  Call      'SENDEMAIL'      Jan 11, 2005 R.Power
     c*                  Parm      UserId        Email_Code      Jan 11, 
2005 R.Power
     c*                  Parm      *Blanks       From      Jan 11, 2005 
R.Power
     c*                  Parm                    Filename      Jan 11, 
2005 R.Power
     c*                  Parm                    Subject      Jan 11, 2005 
R.Power
     c*                  Parm                    Errcde      Jan 11, 2005 
R.Power 

hence, I'd check errcde for a value.  Now that I've decided to make it a 
procedure, here's what I have:

     D*--------------------------------------------------
     D* Procedure name: Send_Email
     D* Purpose:        Send email to user
     D* Returns:
     D* Parameter:      Email_Code
     D* Parameter:      MsgLen
     D* Parameter:      MsgType
     D* Parameter:      MsgWrkStn
     D* Parameter:      MsgWrk#
     D* Parameter:      MsgMsgQ
     D* Parameter:      MsgError
     D*--------------------------------------------------
     D Send_Email      PR                  EXTPGM('SENDEMAIL')      Jan 
18, 2005 R.Power
     D  E_Code                       10A   Const      Jan 18, 2005 R.Power
     D  E_From                       50A   Const      Jan 18, 2005 R.Power
     D  E_Filename                  100A   Const      Jan 18, 2005 R.Power
     D  E_Subject                    50A   Const      Jan 18, 2005 R.Power
     D  E_Errcde                      3A   Const      Jan 18, 2005 R.Power 


     ?* Use api to send email with attachment to user profile running 
software
     c                   CallP     
Send_Email(UserId:*Blanks:Filename:Subject:  Jan 18, 2005 R.Power
     c                             Errcde)      Jan 18, 2005 R.Power

Can I still check Errcde for the value returned or do I have to setup 
something different because of the way it's passed back and forth?

Thanks,

Ron Power
Programmer
Information Services
City Of St. John's, NL
P.O. Box 908
St. John's, NL
A1C 5M2
Tel: 709-576-8132
Email: rpower@xxxxxxxxxx
Website: http://www.stjohns.ca/
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