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Restrictions on what jobs will run on a given resource are enforced by only starting jobs that meet specific constraints, and these constraints are specified as part of the configuration.

To specify that a given machine should only run certain users' jobs, and always run the jobs regardless of other activity on the machine, load average, etc., place the following entry in the machine's HTCondor configuration file: 

START = ( (User == "userfoo@baz.edu") || \
          (User == "userbar@baz.edu") )

A more likely scenario is that the machine is restricted to run only specific users' jobs, contingent on the machine not having other interactive activity and not being heavily loaded. The following entries are in the machine's HTCondor configuration file. Note that extra configuration variables are defined to make the START variable easier to read. 

# Only start jobs if:
# 1) the job is owned by the allowed users, AND
# 2) the keyboard has been idle long enough, AND
# 3) the load average is low enough OR the machine is currently
#    running an HTCondor job, and would therefore accept running
#    a different one
AllowedUser    = ( (User == "userfoo@baz.edu") || \
                   (User == "userbar@baz.edu") )
KeyboardUnused = (KeyboardIdle > $(StartIdleTime))
NoOwnerLoad    = ($(CPUIdle) || (State != "Unclaimed" && State != "Owner"))
START          = $(AllowedUser) && $(KeyboardUnused) && $(NoOwnerLoad)

To configure multiple machines to do so, create a common configuration file containing this entry for them to share.