Because the syntax of a call statement is very special here is a special function to analyze the CALL statement.
A call statement is a keyword CALL followed by a function call.
If the function or sub is already defined then the keyword CALL can be missing.
When the function or sub is called this way and not inseide an expression the enclosing parentheses can be missing.
peNODE ex_IsCommandCALL(peXobject pEx,
To get some description of waiting labels see the description of the function ex_PushWaitingLabel().