Getting Help with IDL

IDL's online help system provides access to information on all aspects of IDL. The complete IDL documentation set is available online in HTML format. To use the IDL online help system, do one of the following:

Enter the ? command (optionally followed by a routine or object name) at the IDL command prompt

Call the ONLINE_HELP procedure at the IDL command prompt or within an IDL program

If you are running the IDL Workbench, select the Help → Help Contents option from the menu bar

Select IDL Help from the Microsoft Windows Start menu

Double-click on the IDLHelp Macintosh icon

IDL's online help system is described in detail in Using IDL Help — located, appropriately enough, in the IDL online help system.