Hi Leroy,
Thank you for posting to the Forum!
In the expression you can use a variable to wrap all of your logic in using a compound expression, once the variable is set the logic will not run again, be sure to set the variable to a value at the end of your expression and inside the compound.
Here is an example:
if : ( ModelLoad = 0 )
{
RunAction( "Initialise" ) ;
ModelLoad := 1 ;
}
You can find further information using our Documentation Portal
Please let us know if this helps
Burns