February 12, 2011 
Definition:
function wp_admin_css( $file = 'wp-admin', $force_echo = false ) {}
Enqueues or directly prints a stylesheet link to the specified CSS file.
"Intelligently" decides to enqueue or to print the CSS file. If the ‘wp_print_styles’ action has *not* yet been called, the CSS file will be enqueued. If the wp_print_styles action *has* been called, the CSS link will be printed. Printing may be forced by passing TRUE as the $force_echo (second) parameter.
Parameters
- string $file: Optional. Style handle name or file name (without “.css” extension) relative to wp-admin/. Defaults to ‘wp-admin’.
- bool $force_echo: Optional. Force the stylesheet link to be printed rather than enqueued.
Defined filters
- wp_admin_css
apply_filters( 'wp_admin_css', "<link rel='stylesheet' href='" . esc_url( wp_admin_css_uri( $file ) - wp_admin_css
apply_filters( 'wp_admin_css', "<link rel='stylesheet' href='" . esc_url( wp_admin_css_uri( "$file-rtl" )
Source code
function wp_admin_css( $file = 'wp-admin', $force_echo = false ) {
global $wp_styles;
if ( !is_a($wp_styles, 'WP_Styles') )
$wp_styles = new WP_Styles();
// For backward compatibility
$handle = 0 === strpos( $file, 'css/' ) ? substr( $file, 4 ) : $file;
if ( $wp_styles->query( $handle ) ) {
if ( $force_echo || did_action( 'wp_print_styles' ) ) // we already printed the style queue. Print this one immediately
wp_print_styles( $handle );
else // Add to style queue
wp_enqueue_style( $handle );
return;
}
echo apply_filters( 'wp_admin_css', "<link rel='stylesheet' href='" . esc_url( wp_admin_css_uri( $file ) ) . "' type='text/css' />\n", $file );
if ( is_rtl() )
echo apply_filters( 'wp_admin_css', "<link rel='stylesheet' href='" . esc_url( wp_admin_css_uri( "$file-rtl" ) ) . "' type='text/css' />\n", "$file-rtl" );
}
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A HitchHackers guide through WordPress 
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