You can group certain instruments or channels together and treat them as a single entity. When all the instruments of the same type belong to a single group or when the instruments of the same type in a subsystem belong to a single group, you can use the versions of the pin query VIs and .NET methods that return a single session and you do not need to use parallel For Loops to iterate over the instrument driver sessions. The instrument driver specific to the grouped instruments performs most operations on all channels in parallel to achieve improved multisite efficiency. Refer to the instrument driver help for information about hardware limitations that prevent certain instruments from operating together as a single instrument.