Unfortunately, the scheduler program is a bit outdated and does not have the support that it once did. I just posted a document that outlines some popular commands that can be used in the scheduler, as well as their syntax: ChemStation Scheduler Commands
This document hopefully answers your second question.
For your first question, the only thing that I can recommend would be to try to run a repair on your OpenLAB ChemStation software. It is possible that the scheduler installation somehow became corrupt. As i mentioned, the scheduler has not been updated in quite some time so I am not sure how stable it is on newer operating systems.
What model GC are you using? If you have a 7890B you can use the clock table to achieve the same functionality you are trying to setup in the scheduler.
Thank you very much
the command worked perfectly on both the command line and the scheduler.
and for the scheduler I found 2 files in the main Chem32 folder has not type (one is .004 and other .005) I have deleted them and the scheduler worked again.
I open the 2 files by notepad and found some commands I have written before so I deleted them.
the same is found on the 2nd PC - 3 files- I deleted them and the scheduler worked again.
in our laboratory we're having both A & B models
thank you again
this been very helpful