From the wonderful RedGuides Wiki

This command is added by EverQuest

Syntax Key
Notation Description
Text without brackets or braces Required items
<Text inside angle brackets> Placeholder for which you must supply a value
[Text inside square brackets] Optional items
Vertical bar (|) Separator for mutually exclusive items; choose one
{Text | inside | braces} Set of required items; choose one
Ellipsis () Items that can be repeated
Syntax /system <cmd> [arguments]
Description Run commands on your computer, as if from the Windows command prompt. To use, EnableSystemCommand=1 must be set in the [default] section of eqclient.ini



/system notepad c:\myfile.txt - Will open the notepad program, which will ask if you'd like to create 'myfile.txt'

See also