Function

When activated:

1. If there is an IT instruction, a next activation of the node is scheduled to happen at the time TIME + IT.
2. A message is generated that always contains the default fields:
   • GT Generation Time: contains the value of TIME at the generation.
   • USE quantity of resource to be used in node R. Initialized to 1 as default value.
   • ET to put the time of entrance in a list (EL or IL).
   • XT to put the time of future exit from a list (EL or IL).
   • NUMBER number of the message generated in the node.
   • NODE name of the node.

   The user can change the USE by a USE instruction.
   NUMBER, NODE and GT remain constant.
   ET are changed by the GLIDER system each time the message enters a list.
   XT is updated each time the message enters a IL and a departure time from it is scheduled.

3. The user's instructions are processed. These may usually be assignation of values to the message fields and SENDTO instructions to the message to other nodes (one and only one SENDTO is to be executed).
   Assignation of values to the fields are made by assigning values to the corresponding field variables. If there is not a SENDTO instruction in the code, the message is automatically sent to the successor node. If there are more than one successor, a copy is sent to each successor.
4. Before the sending of the message the actual values of the field variables are passed to the message fields.