The default in this case is Evaluate so you can click again or press RETURN to get the same effect as the old right double click. The options on the menu are:

Evaluate	This will display the value of the variable or expression in the Evaluate Window (in LIST DIM format for variable). This is usually the default so you can click again or press RETURN to get the same effect as the old right double click.
Cut	Cut current text selection into clipboard.
Copy	Copy current text selection into clipboard.
Paste	Paste the data currently in clipboard.
Toggle collapse	Toggle the collapsed state of current statement or it the current statement isn't collapsible its parent.
Goto definition	Goto user type definition. Use the text currently under the cursor as the context.
Goto declaration	Goto variable declaration. Use the text currently under the cursor as the context.
Select All	Select all the text in current file.
Select Expression	This will just select the expression displaying it in reverse. It has the same effect as F5. KCML will attempt to match the whole expression by looking for the closing bracket for functions like STR(
Select Line	This will select the whole statement (one line on the screen) containing the item you clicked.
Display Variable	For string variables only this will bring up the Display Variable window showing the contents of the string. This is particularly useful for large string variables. See Inspecting Variables
Modify Variable	This is only available for variables or expressions that are legal on the left hand side of LET statements. It displays a modify dialog box showing the current value and allowing a new value to be entered. If you OK this dialog the variable is modified and a line is written to the output window confirming it.
Watch Variable	Add the variable or expression to watch window.
Trap Variable	This will set a breakpoint on the variable. Execution will stop if the variable is modified.
Load into Foreground
Clear P; Load into Foreground
Revisit	If you have jumped to this part of the program as a result of actioning then this will return you to the previous location just like the F6 revisit key.
Help	This will display an appropriate help page if used with a KCML keyword. It can also display application help for DEFSUB functions if a suitable file has been registered. See the page on documentation for more information on how this works.

Code Sub-Menu

Collapse Statements	Collapse Statements.
Change Case	Change the case of the selected text.
Toggle Comments	Toggle wether the currently selected lines are commented out or not.
Suggest	This brings up a suggestions popup menu containing variables that have the same stem as the selected variable, allowing auto-completion. You can also trigger this with ALT-DOWN

Debug Sub-Menu

Set Program to Cursor Line	Set PC to cursor line.
Run from Cursor Line	This will attempt to run the program from the mouse position. This will perform some checks to see if the program is in a safe state to run from hear.
Run until Cursor Line	This will run the program until it finishes or execution reaches the cursor line, where it will stop.

Context Menus