Assets in following namespaces are available straight from FRENDS expressions* without need to write complete namespace:

System
System.Net
System.Security
System.Xml
System.Xml.Linq
System.Data
System.Threading.Tasks
System.Dynamic
System.Linq
System.Collections.Generic
System.Reflection
Newtonsoft.Json
Newtonsoft.Json.Linq

In addition functions from 

Microsoft.CodeAnalysis
Microsoft.CSharp

and from mscorlib (Multilanguage Standard Object Runtime Library) are available, when complete namespace of the function is written.

mscorlib includes for example:

System.Collections
System.Configuration.Assemblies
System.Diagnostics
System.Diagnostics.SymbolStore
System.Globalization
System.IO
System.IO.IsolatedStorage
System.Reflection.Emit
System.Resources
System.Runtime.CompilerServices
System.Runtime.InteropServices
System.Runtime.InteropServices.Expando
System.Runtime.Serialization
System.Runtime.Serialization.Formatters
System.Runtime.Serialization.Formatters.Binary
System.Security.Cryptography
System.Security.Cryptography.X509Certificates
System.Security.Permissions
System.Security.Policy
System.Security.Principal
System.Text
System.Threading
Microsoft.Win32 


*These namespaces are available for FRENDS Processes from the .NET Framework. Custom Tasks can use additional references to provide extra namespaces and functionality.

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