I need to hide the pcAnywhere tray icon, how can this be done?
You can set this configuration option for Windows clients.
In the Symantec Management Console navigate to Settings > Agents/Plug-ins > All Agents/Plug-ins. Here navigate into Remote Management > Remote Control > Windows and select the "PcAnywhere Settings - Windows" option.
On the PcAnywhere Settings - Windows Host Configuration Settings page select the Security tab. Here simply check/enable the Hide host tray icon option.
Save the changes and let the settings propagate to the clients. This should happen as part of the Client Configuration Policy refresh cycle.
NOTE: This won't suppress the balloon notification when a connection is made.