| $$BHS | 
Extrinsic function call
$$BHS^HLFNC1(HLMTN,HLSEC,HLMSA), builds HL7 Batch Header (BHS) segment.  HLMTN
and all variables created by INIT^HLTRANS are required.  HLSEC & HLMSA are
optional.
 
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$$HLFLDS | 
Extrinsic function call $$HLFLDS^HLFNC1(APP,SEG),
returns HL7 fields used for a specified HL7 segment.  APP & SEG required.
 
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$$MSH | 
Extrinsic function call $$MSH^FLFNC1(HLMTN,HLSEC),
builds an HL7 Message Header (MSH) segment.  HLMTN and all variables created
by INIT^HLTRANS are required.  HLSEC optional.
 
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