42126
Operation Each of the user companies ( the RTS Users , or Service Providers ) has its own database on the Central Teleswitch Control Unit ( CTCU ) , which is an HP Integrity computer running OpenVMS on IA-64 for reliability and clustering technology to minimise downtime .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None