In a param or paramH parameter, the first character is the field separator (`:' here). The first field is the type of the first component (M, L, B, C or T), followed by its n parameters in the forthcoming n fields. Then the same for the second component, etc. Component parameters:

:M:width:height	width and height are in pixel units.
:L:fontprops	fontprops: font properties.
:B:fontprops:: :B:fontprops:description: :B:fontprops:description:frame	fontprops: font properties, description: description string, target: target frame for the URL ("_self" = show in the window and frame that contain the applet, "_parent" = show in the applet's parent frame, "_top" = show in the top-level frame of the applet's window, "_blank" = show in new window).
:C:fontprops: :C:fontprops:description	fontprops: font properties, description: description string. You may specify the checkbox group number in the type field, by writing gn next to the type-specifying character C, where n is the group number. No more than one button in a group can be pressed at the same time.
:T:fontprops :T:fontprops:columns :T:fontprops:columns:editable	fontprops: font properties, columns: number of columns, editable: editable (rw) or read only (r).

The fontprops field usually contains only one number, the font size. Additional properties are "b" (bold font) and "i" (italic). A 12pt bold italic font is specified as "12bi".

Example: