It should be a fixed syntax,for example, for SQL Pass-Through Facility Specifics for DB2:
proc sql;
Connect to DB2(....);
....
Disconnect from DB2;
So the two mvs are simply text replacements, the system will automatically read those embedded information  like user, password, mode, etc..
since Rsubmit, it may be on Server.... in fact, if the system is mature enough, RSUBMIT/ENDRSUBMIT statement should NOT be explicit
JingJu