Question about Custom Periodic IO Servers

I have some single-precision.  Are they also converted to 'variant', as stated here: (From Labview Help)
Use double-precision, string, and Boolean data types when you create a VI to convert into a custom I/O server. These data types are the most efficient to use when publishing data items. LabVIEW converts other data types to variants, which can slow down the performance of the server.

Thanks for the info.  Another question!!!  I actually have a total of 5 I/O Servers, communicating with different com ports, etc.
I have to have them launch in a certain order, so I have a Windows system service that launches first, upon reboot, and that task deploys each library associsted with the IO Servers.  I have come to the conclusion that I have to launch the library we have been discussing first.  If it is not first, it does not launch properly - I get Error Code: 1003.  As I said, it does return alot of values - 48 of them, mostly double, some string.  But otherwise, I have tried to make it as simple a VI as possible.  Any ideas as to why it has to be launched first?  I would really rather it be the 2nd one.  I have a I/O Server that controls an APC Switch, and one outlet on the switch turns on the power for the monitored hardware points, so that one really needs to launch first.
I might as well post my other question/concern.  My last IO Server is one that does not talk to any hardware.  It reads values from the other servers, does some math, and returns the values.  It contains my alarms variables.  It has no shared variables.  I read the variables via Open Variable Connection / Read Variable under the Shared Variable Node palette.  It runs properly if I launch it manually, but I get Error 1 when my Windows system Service launches it.  It contains no other subVIs besides the Shared Variable VIs I mentioned.  The IO Server VI only returns 4 values.  The rest of the shared variables in the library require no calculation, so they are bound to shared variables in other libraries - which have already been deployed by the time my Windows System Service launches this last one.  I have waits in my system service, to ensure that the other libraries have been launched.
Gretchen

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