Can both applications run at the same time and access the same database on mainframe.
Release : 11.5
Component : CA OUTPUT MANAGEMENT WEB VIEWER FOR ALL PLATFORMS
No. 11.5 and 12.1 Web Viewers may not share the Web Viewer database, should not share the same DRAS, but may access the same CA View repositories.
You can run both 11.5 and 12.1 simultaneously, but you will need separate DRAS and SQL databases. The 12.1 system will be accessing it's database differently - via JDBC instead of ODBC, and while you may use MS SQL Server, you might also use another JDBC compliant DB instead. 12.1 Web Viewer is hosted under Tomcat or WebSphere, where 11.5 Web Viewer runs under MS IIS.