How to select data from differents servers with a single query?
UNION is what you're looking for.

Select * from server1.tableS1.sys.view
union all
Select * from server2.tableS2.sys.view
union all
Select * from server3.tableS3.sys.view
union all
Select * from server4.tableS4.sys.view


You might want to do:

Select 'server1',* from server1.tableS1.sys.view
union all
Select 'server2',* from server2.tableS2.sys.view
union all
Select 'server3',* from server3.tableS3.sys.view
union all
Select 'server4',* from server4.tableS4.sys.view


... if you need to identify which rows came from which.