Here’s a simple, authentic Jain perspective on these three bhashyas (if you have a specific text or school in mind, tell me to refine):

1) Guruvandan

• What it is: A salutary homage to the guru (teacher) who leads the disciple to right faith, right conduct, and right knowledge.
• Core meaning (arth): It venerates the guru as a spiritual guide who mirrors the path toward kevali/nirvana and helps the disciple dispel ignorance. The guru is seen as essential for internal transformation, just as the Tirthankaras provide the ultimate guidance in Jain dharma.
• How it’s understood in Jainism: The act of Guruvandan emphasizes humility, gratitude, and the student’s dependence on a genuine teacher. It reinforces the Jain emphasis on disciplined study, self-control, and ethical action under a trusted guide.
• Differences between Digambar/Shwetambar: Both traditions respect the guru, but wording and emphasis can vary in their bhakti-poetic traditions. The core idea—reverence for the true teacher of Jain dharma—remains the same.

2) Chaityavandan

• What it is: A form of devotional salutation (stotra) dedicated to the arihants, siddhas, and other worthy beings (like the Tirthankaras and spiritual teachers) whom Jain scriptures extol.
• Core meaning (arth): It expresses reverence for the liberated beings who have dispelled bondage and realized perfect knowledge. It is an act of remembrance, aspiration, and alignment of the heart with non-violence (ahimsa), truth (satya), and other Jain virtues.
• How it’s understood in Jainism: Chaityavandan is not mere poetry; it is a meditative practice that helps the practitioner cultivate awe, humility, and firm resolve to live purely according to Jain ethics. It also reinforces the ideal of the jina (victor) as the highest source of guidance.
• Differences between Digambar/Shwetambar: The exact renditions and favorite chaityas/stotras differ by sect, but the purpose—honoring liberated beings and seeking their auspicious influence—is shared.

3) Pachhkhan (often read as Panchkhān, or related fivefold devotional texts)

• Important note: I want to ensure I’m addressing the exact term you have in mind. “Pachhkhan” as a title is not universally standard in Jain liturgy, and there are several similarly named works or panch (five)fold sections in different Jain traditions. It could refer to a specific fivefold invocation, meditation, or a coalesced bhashya set in a particular manuscript or school.
• If by Pachhkhan you mean a fivefold devotional sequence in a given tradition, the general idea would be: a structured practice that calls upon five respected spiritual aspects (for example, fivefold reverence to arihants, siddhas, acharyas, upadhyayas, and sadhus) or five components of practice (like faith, knowledge, conduct, penance, and sharing/compassion) depending on the text.
• Core meaning (arth) in Jain context: Such fivefold schemes typically aim to organize devotion, reflection, and ethical practice into a coherent framework, helping the practitioner cultivate right faith, right knowledge, and right conduct systematically.
• How it’s understood in Jainism: The exact content varies by text and sect, but the underlying aspiration is the same: to stabilize the mind on the Jain path, increase reverence for liberated beings, and strengthen disciplined living.
• Differences between Digambar/Shwetambar: If Pachhkhan is a specific text, its exact verses, order, and emphasis may differ between Digambar and Shwetambar manuscripts or recensions. The meaning—devotional framing to support spiritual progress—generally aligns across traditions, though the phrasing and included figures can differ.

A couple of practical tips to identify the exact texts you have in mind:

• If you have the exact spelling in your source (Devanagari or Gujarati/Marathi transliteration), share it and I’ll pin down the precise Jain bhashya and give you a clean summary.
• If you can name the author or the monastery/sagal (school) where it’s taught, that helps clarify which version you’re studying.

Note for accuracy: If you intended a specific text named Pachhkhan and you can provide a manuscript line or a context (Digambar or Shwetambar), I’ll give a precise summary and point out any traditional differences between the two traditions.