Sure, TSOCMD("OPSQL.........SYSTEM(SYXX)") will simply asynchronously execute a cross system OPSQL, but you still are in the 'dark' if it worked or not. Since you are dispatching a TSO cmd to the server, why not just take the extra steps and dispatch an OPS/REXX to the server that has the logic to programmatically react to the system possibly not being there yet rather than 'assume' it is? Also, is this 'other' system in a sysplex? If it is in a sysplex, and you still just want to 'ship' over a command and not validate it, why not just send over a pseudo command (such as the SSMPLEXC sample does) via the ROUTE command as sysplex communication is set up in early IPL with less pieces involved than MSF. Lastly, as I dont know all the details of this resource and the exact control requirements you are needing to set up, perhaps an OPS/REXX program triggered for the UP_DOWN action that simply determines if it needs to be started or not (up on the other system so just set CS=DOWN/DS=DOWN or maybe CS=SYxx DS=SYxx to show its active on SYxx) or whatever. You would of course programmatically 'recheck' the other system every 30 secs or so 'if' you are unable to communicate to the 'other' system (MSF and/or Sysplex connectivity not established yet). Also, if the other system is in a sysplex, you can utilize the SSMXCHCK sample OPS/REXX pgm in this startup OPS/REXX pgm to determine if the resource is active on the other system. That sample uses either MSF or Sysplex (via Route) to manipulate the cross system status. It will return a value of 'UNKNOWN' if either probe check failed.