Objects TSTC and TSTC_PAR

[Patrice Nolin]

Hi,
 
I'm trying to use an object to start a transaction in my WF without having
to declare an new method for an existing object.
 
I found the objects TSTC and TSTC_PAR. TSTC call the transaction but without
parameter. I can't make TSTC_PAR work and I can't find documentation. Does
someone know how to start a transaction and set parameters for it. Is those
classes are the right ones or I can use another one ?
 
Thanks
 
Pat